KR20170071423A - Optical film manufacturing method and manufacturing device - Google Patents

Abstract

The production method of the optical film (F) has a cutting step. In the cutting step, both end portions (Ta) and (Tb) in the width direction of the long oblique orientation film are cut by the first cut portion 8a and the second cut portion 8b, respectively. The cut and remaining portion is obtained as the optical film (F). In the cutting step, a toe angle with respect to the lower blade 10b on one side and the other side in the width direction with respect to the lower blade 10b in each of the first cutout 8a and the second cutout 8b is On the side where the angle? Formed by the plane S forming the toe angle of the upper blade 10a and the orientation direction of the long oblique orientation film F becomes smaller as the upper blade 10a tilts in the increasing direction The upper blade 10a is disposed and the longer blade 10b and the upper blade 10a are cut by cutting the longer oblique orientation film F. [

Description

[0001] OPTICAL FILM MANUFACTURING METHOD AND MANUFACTURING DEVICE [0002]

The present invention relates to a production method of an optical film and a production apparatus of the optical film, wherein both ends in the width direction of the long oblique orientation film are cut and the remaining portion is obtained as an optical film.

The long optical film is produced by, for example, a solution casting method or a melt casting method. Both ends in the width direction of the produced optical film are cut off by a cutting device because the film thickness is uneven or the shape of the end face is uneven. For example, in Patent Document 1, both ends of the optical film are cut off by using a circular upper edge and a circular lower edge.

Japanese Patent Laid-Open Publication No. 2009-154252 (see claim 1, Figs. 1 and 2, etc.)

Recently, a self-emission type display device such as an organic EL (Electro-Luminescence) display device which is also called an OLED (Organic light-Emitting Diode) attracts attention. In the OLED, since a reflector such as an aluminum plate is provided on the back side of the display in order to increase the light extraction efficiency, the external light incident on the display is reflected by the reflector, thereby lowering the contrast of the image.

Therefore, it is known that a circular polarizer is formed by joining a stretched film and a polarizer in order to improve the contrast of light and shade by preventing reflection of external light, and this circular polarizer is disposed on the surface side of the display. At this time, the circularly polarizing plate is formed by bonding the polarizer and the stretched film so that the in-plane slow axis in the stretched film is inclined at a desired angle with respect to the transmission axis of the polarizer.

At this time, by using a long obliquely stretched film (also referred to as a long obliquely-oriented film) which is stretched in an oblique direction with respect to the longitudinal direction and the width direction as the stretched film, the long polarizing film and the long obliquely- So that the productivity of the circularly polarizing plate can be dramatically improved. Therefore, production of such a long oblique oriented film has been actively conducted recently.

Even in the case of the long oblique orientation film, both end portions in the width direction are cut off by the cutting device after production because the film thickness is uneven. However, when both end portions of the long obliquely-oriented film are cut by the conventional cutting device, when the optical film remaining after the cutting is wound, a very slight deviation in the direction of the winding core occurs on the winding end face, I realized that it was wound. Further, it has been found that a fibrous foreign body (hereinafter, simply referred to as a whisker) and a fluffy weather appear on one side end portion in the width direction of the optical film (product portion) remaining after cutting. This is because, since the alignment direction of the long oblique orientation film is oblique to the longitudinal direction and the width direction, when the long obliquely-oriented film is cut along the longitudinal direction by the cutting apparatus, the orientation of the long obliquely- , It is considered that the long oblique orientation film is liable to be repelled in the alignment direction relative to the cutting apparatus (the upper blade and the lower blade), thereby causing the long obliquely-oriented film to be cut off. If the cutting direction of the long oblique oriented film is poor, it is also likely that the optical film is broken at the time of cutting. It is considered that the above-described skewing of the optical film after the cutting is caused by the fact that the long oblique oriented film is repelled in the alignment direction at the time of cutting.

In the above-described Patent Document 1, the cutting of the long oblique oriented film has not been studied at all. When the object to be cut is a long obliquely oriented film, occurrence of beard or fluffy weather at the end portion of the obliquely- And breakage of the optical film at the time of cutting can not be suppressed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problem, and it is an object of the present invention to provide a method for producing an optical film by cutting both ends of a long oblique orientation film to obtain an optical film, Which is capable of suppressing the breakage of the optical film at the time of exposure.

The above object of the present invention can be achieved by the following production method or apparatus for an optical film.

That is, in a method for producing an optical film according to one aspect of the present invention, both end portions in the width direction of a long oblique orientation film whose alignment direction is inclined with respect to the width direction in the film face are respectively referred to as a first cut portion and a second cut portion A method for producing an optical film having a cutting step for cutting an end portion of a long obliquely oriented film,

Wherein the first cut portion and the second cut portion are formed by cutting

A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,

And a second blade disposed on the other side of the film surface and inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane,

In the cutting step,

In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed between the plane forming the toe angle of the second blade and the orientation direction of the long oblique orientation film is reduced, The long oblique oriented film is cut by cutting.

An apparatus for producing an optical film according to another aspect of the present invention includes a first cut portion and a second cut portion for cutting both end portions in the width direction of a long oblique orientation film whose alignment direction is inclined with respect to the width direction in the film plane And a portion of the long oblique orientation film which is cut off at both end portions thereof is taken as an optical film,

Wherein the first cut portion and the second cut portion are formed by cutting

A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,

Wherein the rotating shaft is inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane, And a second blade for cutting and cutting the long oblique oriented film therebetween,

In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed by the plane forming the toe angle of the second blade and the alignment direction of the long oblique orientation film is reduced.

According to the manufacturing method and the manufacturing apparatus, since the second oblique oriented film is cut on the side where the second blade is closer to the orientation direction of the long oblique orientation film relative to the first blade in the width direction, The resistance at the time of cutting due to the orientation of the long obliquely-oriented film can be suppressed as compared with the case where the second blade is disposed at the side opposite to the above-described blade. As a result, at the time of cutting, the long oblique orientation film is hardly repelled in the alignment direction relative to the first cut portion and the second cut portion, and the state of cutting the long obliquely-oriented film can be improved. As a result, even when both ends of the long oblique orientation film are cut to obtain an optical film, it is possible to suppress generation of whiskers and fluffy ends at the end portion of the optical film, and breakage of the optical film at the time of cutting.

1 is a plan view schematically showing a schematic configuration of an optical film production apparatus according to an embodiment of the present invention.
2 is a plan view schematically showing an example of a rail pattern of a stretching portion provided in the manufacturing apparatus.
3 is a perspective view showing a schematic structure of a film cutting apparatus provided in the production apparatus.
4 is a plan view of the film cutting apparatus.
5 is a plan view of the film cutting apparatus of the reference example.
6 is a cross-sectional view showing a schematic structure of an organic EL display device as an example to which an optical film manufactured by the manufacturing apparatus is applied.
7 is a cross-sectional view showing a schematic configuration of a liquid crystal display device as another example to which the optical film is applied.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the present specification, when numerical ranges are denoted by A to B, values of lower limit A and upper limit B are included in the numerical range. The present invention is not limited to the following contents.

The method for producing an optical film according to the present embodiment includes a cutting step of cutting both end portions in the width direction of a long oblique orientation film in which the alignment direction is inclined with respect to the width direction in the film face by the first cut portion and the second cut portion, And a portion of the long oblique orientation film that has been cut off at both ends thereof is taken as an optical film. Wherein the first cut portion and the second cut portion are respectively disposed on one side with respect to the film surface of the long oblique orientation film and have a first blade whose rotation axis is located along the width direction and a second blade on the other side And a second blade whose inclination angle is inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane. Wherein in the cutting step, of each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, in the direction in which the tow angle with respect to the first blade increases, The second blade is arranged on the side where the angle between the plane forming the toe angle of the second blade and the alignment direction of the long oblique orientation film becomes smaller as the second blade is tilted, And the long oblique orientation film is cut off by the second blade.

The apparatus for producing an optical film according to the present embodiment has a first cut portion and a second cut portion for cutting both end portions in the width direction of a long oblique orientation film whose alignment direction is inclined with respect to the width direction in the film plane And a portion of the long oblique orientation film that has been cut off at both ends thereof is taken as an optical film. Wherein the first cut portion and the second cut portion are respectively disposed on one side with respect to the film surface of the long oblique orientation film and have a first blade whose rotation axis is located along the width direction and a second blade on the other side Wherein the rotary shaft is inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane, And a second blade for cutting and cutting. In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed by the plane forming the toe angle of the second blade and the alignment direction of the long oblique orientation film is reduced.

Here, the orientation direction of the long oblique orientation film, that is, the direction of the oblong axis, is preferably in the range of more than 0 degrees and less than 90 degrees with respect to the width direction of the film in the film plane (perpendicular to the thickness direction) (In the longitudinal direction of the film, the angle is also in a direction exceeding 0 ° and less than 90 °). Since the slow axis is usually expressed in the stretching direction or the direction perpendicular to the stretching direction, it is possible to produce a long slant oriented film having such a slow axis by stretching at an angle exceeding 0 DEG and less than 90 DEG with respect to the width direction of the film have. The angle formed by the width direction of the long oblique orientation film and the slow axis, that is, the orientation angle can be arbitrarily set to a desired angle in a range exceeding 0 degrees and less than 90 degrees.

In the present embodiment, the film is long and has a length of at least about 5 times or more of the width of the film, preferably 10 times or more, more specifically, a length of a length that is rolled up and stored or transported (Film roll).

When a long oblique oriented film is produced, the film can be made to have a desired length by continuously producing the film. The long oblique orientation film may be produced by forming a long film and winding it once on a winding core to form a winding body and supplying a long film from the winding body to the oblique stretching step, The film may be continuously supplied from the film forming step to the oblique stretching step. The film forming step and the oblique stretching step are preferably performed in succession because the desired film orientation can be obtained by changing the film forming conditions by feeding back the results of film thickness and optical value after stretching.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, when a long film is described, it refers to a long film to be stretched in the warp stretching step and is distinguished from the long oblique oriented film after warp stretching.

<About long film>

The long film to be drawn in the optical film production apparatus (to be described in detail later) of the present embodiment is not particularly limited and may be any film as long as it is made of a thermoplastic resin. For example, When it is used, a film made of a resin having transparency with respect to a desired wavelength is preferable. Examples of such resins include polycarbonate resins, polyether sulfone resins, polyethylene terephthalate resins, polyimide resins, polymethyl methacrylate resins, polysulfone resins, polyarylate resins, polyethylene resins, A polyvinyl chloride resin, an olefin polymer resin having an alicyclic structure (an alicyclic olefin polymer resin, simply referred to as a cycloolefin resin), and a cellulose ester resin.

Among them, a polycarbonate resin, an alicyclic olefin polymer resin, and a cellulose ester resin are preferable from the viewpoints of transparency and mechanical strength. Among them, an alicyclic olefin polymer-based resin and a cellulose ester-based resin, which easily adjust the retardation in the case of using an optical film, are more preferable. Therefore, the alicyclic olefin polymer-based resin, the cellulose ester-based resin, and the polycarbonate-based resin, which are preferably used in the present embodiment, will be described below.

[Alicyclic olefin polymer resin]

Examples of the alicyclic olefin polymer-based resin include a cyclic olefin random multi-component copolymer disclosed in JP-A-05-310845, a hydrogenated polymer described in JP-A-05-97978, A thermoplastic dicyclopentadiene ring-opening polymer and a hydrogenated product thereof described in JP-A-124429 may be employed.

The alicyclic olefin polymer resin is a polymer having an alicyclic structure such as a saturated alicyclic hydrocarbon (cycloalkane) structure or an unsaturated alicyclic hydrocarbon (cycloalkene) structure. The number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually from 4 to 30, preferably from 5 to 20, and more preferably from 5 to 15. When the mechanical strength, heat resistance, And the moldability characteristics are highly balanced.

The proportion of the repeating unit containing an alicyclic structure in the alicyclic olefin polymer may be suitably selected, but is preferably 55% by weight or more, more preferably 70% by weight or more, particularly preferably 90% by weight or more. When the proportion of the repeating unit having an alicyclic structure in the alicyclic polyolefin resin is within this range, the transparency and heat resistance of the optical material such as the retardation film obtained from the long obliquely oriented film of the present embodiment are improved.

Examples of the olefin polymer resin having an alicyclic structure include a norbornene resin, a monocyclic cycloolefin resin, a cyclic conjugated diene resin, a vinyl alicyclic hydrocarbon resin, and a hydride thereof. Among them, the norbornene resin can be preferably used because it has good transparency and moldability.

As the norbornene resin, for example, a ring-opening polymer of a monomer having a norbornene structure or a ring-opening copolymer of a monomer having a norbornene structure and another monomer or a hydride thereof, an addition polymer of a monomer having a norbornene structure Or addition copolymers of monomers having a norbornene structure and other monomers, or hydrides thereof. Among them, a ring-opening (co) polymer hydride of a monomer having a norbornene structure is particularly preferably used from the viewpoints of transparency, moldability, heat resistance, low hygroscopicity, dimensional stability and light weight.

As a method of molding a long film using the norbornene resin as described above, a solution casting method (solution casting method) or a melt casting method (for example, a melt extrusion method), which will be described later, is preferable. As the melt extrusion method, an inflation method using a die and the like can be mentioned. However, a method using a T-die is preferable in view of productivity and thickness accuracy.

As the extrusion molding method using a T die, a method of maintaining a molten thermoplastic resin in a stable state when it is brought into close contact with a cooling drum, such as that described in Japanese Patent Application Laid-Open No. 2004-233604, It is possible to manufacture a long film having small variations in optical characteristics such as angle.

Specifically, 1) a method in which, when a long film is produced by a melt extrusion method, a sheet-like thermoplastic resin extruded from a die is brought into close contact with a cooling drum under a pressure of 50 kPa or less and is pulled; 2) a method of covering a portion from a die opening portion to a cooling drum which is first brought into close contact with a surrounding member when producing a long film by the melt extrusion method so that the distance from the surrounding member to the die opening portion or the first- (3) a method of warming the temperature of the atmosphere within 10 mm from the sheet-like thermoplastic resin extruded from the die opening portion to a specific temperature when the long film is produced by the melt extrusion method; 4) a method in which a sheet-like thermoplastic resin extruded from a die is brought into close contact with a cooling drum under a pressure of 50 kPa or less and is pulled; 5) A method of spraying a wind having a speed difference of not more than 0.2 m / s from the pulling speed of a cooling drum which is firstly brought into close contact with a sheet-like thermoplastic resin extruded from a die opening portion when a long film is produced by a melt extrusion method have.

The long film may be a single layer or a laminated film of two or more layers. The laminated film can be obtained by a known method such as a coextrusion molding method, a shared softening molding method, a film lamination method, and a coating method. Of these, the co-extrusion molding method and the shared mold forming method are preferable.

[Cellulose ester resin]

Examples of the cellulose ester based resin film include those containing a cellulose acylate satisfying the following formulas (1) and (2), and further containing a compound represented by the following formula (A).

2.0 < / RTI &gt; &lt; RTI ID =

(2) 0? X <3.0

(In the formulas (1) and (2), Z1 represents the total acyl substitution degree of the cellulose acylate, and X represents the total of the propionyl substitution degree and the butyryl substitution degree of the cellulose acylate.)

Hereinafter, general formula (A) will be described in detail. In formula (A), L ₁ and L ₂ each independently represent a single bond or a divalent linking group. Examples of L ₁ and L ₂ include the following structures (in the following, R represents a hydrogen atom or a substituent).

L ₁ and L ₂ are preferably -O-, -COO-, and -OCO-.

R ₁ , R ₂ and R ₃ each independently represent a substituent. Specific examples of the substituent represented by R ₁ , R ₂ and R ₃ include a halogen atom (fluorine atom, chlorine atom, bromine atom and iodine atom), an alkyl group (methyl group, ethyl group, n- Cyclohexyl group, cyclopentyl group, 4-n-dodecylhexyl group, etc.), alkenyl group (vinyl group, allyl group, etc.) (Such as a phenyl group, a p-tolyl group, or a naphthyl group), an alkenyl group (e.g., an isopropyl group, an n-butyl group, , A heterocyclic group (2-furyl group, 2-thienyl group, 2-pyrimidinyl group, 2-benzothiazolyl group and the like), cyano group, hydroxyl group, nitro group, carboxyl group, Butoxy group, 2-methoxyethoxy group, etc.), an aryloxy group (phenoxy group, 2-methylphenoxy group, 4-tert- Phenoxy group, 2-tetra Decanoylaminophenoxy group and the like), an acyloxy group (formyloxy group, acetyloxy group, pivaloyloxy group, stearoyloxy group, benzoyloxy group and p-methoxyphenylcarbonyloxy group) An acylamino group (such as a formylamino group, an acetylamino group, a pivaloylamino group, a lauroylamino group, a benzoylamino group and the like), an alkyl group such as a methylamino group, a dimethylamino group, an anilino group, And arylsulfonylamino groups such as methylsulfonylamino group, butylsulfonylamino group, phenylsulfonylamino group, 2,3,5-trichlorophenylsulfonylamino group and p-methylphenylsulfonylamino group, mercapto group, alkylthio group Methylthio group, ethylthio group, n-hexadecylthio group etc.), arylthio group (phenylthio group, p-chlorophenylthio group, m-methoxyphenylthio group etc.), sulfamoyl group Pamoyl group, N- (3-dodecyloxypropyl) sulfamoyl group, N, N-di (N-phenylcarbamoyl) sulfamoyl group, etc.), a sulfo group, an acyl group (such as an acetyl group and a pivaloylbenzoyl group), an acyl group (Carbamoyl group, N-methylcarbamoyl group, N, N-dimethylcarbamoyl group, N, N-di-n-octylcarbamoyl group, N- (methylsulfonyl) carbamoyl group and the like) .

R ₁ and R ₂ are preferably a substituted or unsubstituted phenyl group or a substituted or unsubstituted cyclohexyl group, more preferably a phenyl group having a substituent or a cyclohexyl group having a substituent, more preferably a , A phenyl group having a substituent at the 4-position, and a cyclohexyl group having a substituent at the 4-position.

R ₃ is preferably a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an aryl group, a heterocyclic group, a hydroxyl group, a carboxyl group, an alkoxy group, an aryloxy group, an acyloxy group, a cyano group, A hydrogen atom, a halogen atom, an alkyl group, a cyano group, or an alkoxy group.

Wa and Wb represent a hydrogen atom or a substituent,

(I) Wa and Wb may combine with each other to form a ring,

(II) at least one of Wa and Wb may have a cyclic structure, or

(III) At least one of Wa and Wb may be an alkenyl group or an alkynyl group.

Specific examples of the substituent represented by Wa and Wb include a halogen atom (fluorine atom, chlorine atom, bromine atom and iodine atom), an alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, (Vinyl group, allyl group and the like), cycloalkenyl group (2-ethylhexyl group and the like), cycloalkyl group (cyclohexyl group, cyclopentyl group, (Such as a phenyl group, a p-tolyl group, or a naphthyl group), a heterocyclic group (such as a cyclopenten-1-yl group or a 2-cyclohexene-1-yl group), an alkynyl group (an ethynyl group or a propargyl group) A cyano group, a hydroxyl group, a nitro group, a carboxyl group, an alkoxy group (a methoxy group, an ethoxy group, an isopropoxy group, an isopropoxy group, an isopropoxy group, 2-methylphenoxy group, 4-tert-butylphenoxy group, 3-nitrophenoxy group, 2-methoxyphenoxy group, Tetradeca An aminophenoxy group and the like), an acyloxy group (formyloxy group, acetyloxy group, pivaloyloxy group, stearoyloxy group, benzoyloxy group and p-methoxyphenylcarbonyloxy group) An amino group, an amino group, a dimethylamino group, an anilino group, an N-methyl-anilino group and a diphenylamino group), an acylamino group (formylamino group, acetylamino group, pivaloylamino group, lauroylamino group and benzoylamino group) (Methylsulfonylamino group, butylsulfonylamino group, phenylsulfonylamino group, 2,3,5-trichlorophenylsulfonylamino group, p-methylphenylsulfonylamino group, etc.), mercapto group, alkylthio group (E.g., methylthio, ethylthio, n-hexyldecylthio etc.), arylthio groups (phenylthio group, p-chlorophenylthio group, m-methoxyphenylthio group etc.), sulfamoyl groups Di-, N- (3-dodecyloxypropyl) sulfamoyl group, N, N-dimethyl sulf (E.g., an acetyl group, a pivaloylbenzoyl group, etc.), a sulfonyl group, an acyl group, an acyl group, an acyl group, an acyl group, (Carbamoyl group, N-methylcarbamoyl group, N, N-dimethylcarbamoyl group, N, N-di-n-octylcarbamoyl group, N- (methylsulfonyl) carbamoyl group and the like) .

The substituent may also be substituted with such a group.

(I) When Wa and Wb are bonded to each other to form a ring, the ring is preferably a nitrogen-containing 5-membered ring or a sulfur-containing 5-membered ring. It is particularly preferable that the formula (A) is a compound represented by the following formula (1) or (2).

In the general formula (1), A ₁ and A ₂ each independently represent -O-, -S-, -NRx- (Rx represents a hydrogen atom or a substituent) or -CO-. Examples of the substituent represented by Rx are the same as the specific examples of the substituent represented by Wa and Wb. Rx is preferably a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group.

In the general formula (1), X represents a nonmetal atom of Groups 14 to 16. X is preferably = O, = S, = NRc, = C (Rd) Re. Here, Rc, Rd and Re represent substituents, and examples thereof are the same as the specific examples of the substituent represented by Wa and Wb. _{L 1, L 2, R 1} , R 2, R 3, n , is _{L 1, L 2, R 1} , R 2, R 3, n and copper in the formula (A).

In the general formula (2), Q ₁ represents -O-, -S-, -NRy- (Ry represents a hydrogen atom or a substituent), -CRaRb- (wherein Ra and Rb represent a hydrogen atom or a substituent) CO-. Here, Ry, Ra and Rb represent a substituent, and examples thereof are the same as the specific examples of the substituent represented by Wa and Wb.

Y represents a substituent. Examples of the substituent represented by Y are the same as the specific examples of the substituent represented by Wa and Wb. Y is preferably an aryl group, a heterocyclic group, an alkenyl group or an alkynyl group.

Examples of the aryl group represented by Y include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group and a biphenyl group, and a phenyl group and a naphthyl group are preferable, and a phenyl group is more preferable.

Examples of the heterocyclic group include a heterocyclic group containing at least one hetero atom such as a nitrogen atom, an oxygen atom, and a sulfur atom such as a furyl group, a pyrrolyl group, a thienyl group, a pyridinyl group, a thiazolyl group and a benzothiazolyl group , A furyl group, a pyrrolyl group, a thienyl group, a pyridinyl group, and a thiazolyl group are preferable.

The aryl group or the heterocyclic group may have at least one substituent. Examples of the substituent include a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyano group, a nitro group, an alkylsulfinyl group having 1 to 6 carbon atoms, an alkylsulfonyl group having 1 to 6 carbon atoms, a carboxyl group, a fluoroalkyl group having 1 to 6 carbon atoms, An alkylthio group having 1 to 6 carbon atoms, an alkylthio group having 1 to 6 carbon atoms, an N-alkylamino group having 1 to 6 carbon atoms, an N, N-dialkylamino group having 2 to 12 carbon atoms, an N-alkylsulfamoyl group having 1 to 6 carbon atoms , An N, N-dialkylsulfamoyl group having 2 to 12 carbon atoms, and the like.

_{L 1, L 2, R 1} , R 2, R 3, n , is _{L 1, L 2, R 1} , R 2, R 3, n and copper in the formula (A).

(II) Specific examples of the case where at least one of Wa and Wb in the general formula (A) has a ring structure is preferably the following general formula (3).

In the general formula (3), Q ₃ represents ═N- or ═CRz- (Rz represents a hydrogen atom or a substituent), and Q ₄ represents a nonmetal atom of Groups 14 to 16. Z represents a group of nonmetal atoms forming a ring together with Q ₃ and Q ₄ .

Q ₃ , Q ₄ and Z may be further condensed to separate rings. The ring formed of Q ₃ , Q ₄ and Z is preferably a nitrogen-containing 5-membered ring or a 6-membered ring condensed with a benzene ring.

_{L 1, L 2, R 1} , R 2, R 3, n , is _{L 1, L 2, R 1} , R 2, R 3, n and copper in the formula (A).

(III) When at least one of Wa and Wb is an alkenyl group or an alkynyl group, they are preferably a vinyl group or an ethynyl group having a substituent.

Among the compounds represented by the general formulas (1), (2) and (3), the compound represented by the general formula (3) is particularly preferable.

The compound represented by the general formula (3) is superior in heat resistance and light resistance to the compound represented by the general formula (1), and is superior in solubility to an organic solvent, Compatibility is good.

The compound represented by the formula (A) may be contained in an amount of 1 to 15% by mass relative to the cellulose derivative, more preferably 2 By mass to 10% by mass. Within this range, sufficient dispersibility of the cellulose derivative and dispersibility of the cellulose derivative can be imparted.

The compounds represented by the general formula (A), the general formula (1), the general formula (2) and the general formula (3) can be obtained by referring to a known method. Specifically, Journal of Chemical Crystallography (1997); 27 (9); 512-526), JP-A-2010-31223, JP-A-2008-107767, and the like.

(For cellulose acylate)

The cellulose acylate film according to the present embodiment contains cellulose acylate as a main component. For example, the cellulose acylate film according to the present embodiment contains cellulose acylate in an amount of preferably 60 to 100 mass% relative to the total mass (100 mass%) of the film. The degree of substitution of the cellulose acylate with respect to the total acyl group is preferably 2.0 or more and less than 3.0, and more preferably 2.2 to 2.7.

Examples of the cellulose acylate include cellulose ester and an ester of an aliphatic carboxylic acid and / or aromatic carboxylic acid having about 2 to 22 carbon atoms, and more preferably an ester of cellulose and a lower fatty acid having 6 or less carbon atoms.

The acyl group bonded to the hydroxyl group of the cellulose may be straight chain, branched or may form a ring. Further, a substituent may be substituted. When the substitution degree is the same, the number of carbon atoms is preferably selected from an acyl group having from 2 to 6 carbon atoms, and the total sum of propionyl substitution degree and butyryl substitution degree is from 0 to less than 3.0 to be. The cellulose acylate preferably has 2 to 4 carbon atoms, more preferably 2 to 3 carbon atoms.

Specifically, examples of the cellulose acylate include cellulose esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate propionate butyrate or cellulose acetate phthalate, as well as acetyl groups such as mixed fatty acids of cellulose having a propionate group, a butyrate group or a phthalyl group Esters can be used. The butyryl group forming the butyrate may be linear or branched.

In the present embodiment, cellulose acetate, cellulose acetate butyrate, or cellulose acetate propionate is particularly preferably used as the cellulose acylate.

The cellulose acylate preferably satisfies the following formulas (i) and (ii) simultaneously.

(I) 2.0? X + Y < 3.0

(Ii) 0? X <3.0

Y represents the substitution degree of the acetyl group, and X represents the substitution degree of the propionyl group or the butyryl group or mixture thereof.

Further, in order to obtain optical characteristics suitable for the purpose, resins having different degree of substitution may be mixed and used. The mixing ratio at that time is preferably 1:99 to 99: 1 (mass ratio).

Among the above-mentioned materials, cellulose acetate propionate is preferably used as the cellulose acylate. In the cellulose acetate propionate, it is preferable that 0? Y? 2.5 and 0.5? X? 3.0 (provided that 2.0? X + Y? 3.0) ? 2.0 (however, 2.0? X + Y? 3.0). The substitution degree of the acyl group can be measured in accordance with ASTM-D817-96, which is one of the standards developed and published by the American Society for Testing and Materials (ASTM).

The number average molecular weight of the cellulose acylate is preferably in the range of from 60000 to 300000 because the mechanical strength of the obtained film is increased. More preferably, a cellulose acylate having a number average molecular weight of 70,000 to 200,000 is used.

The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the cellulose acylate are measured using gel permeation chromatography (GPC). The measurement conditions are as follows. The present measurement method can also be used as a method for measuring other polymers in the present embodiment.

Solvent: methylene chloride;

Column: Three shodex K806, K805, and K803G (manufactured by Showa Denko Kabushiki Kaisha) are connected and used;

Column temperature: 25 캜;

Sample concentration: 0.1 mass%;

Detector: RI Model 504 (manufactured by GL Science);

Pump: L6000 (manufactured by Hitachi Seisakusho Co., Ltd.);

Flow rate: 1.0 ml / min

Calibration curve: standard polystyrene STK standard A calibration curve of 13 samples of polystyrene (manufactured by Toso Chemical Co., Ltd.) Mw = 1000000 to 500 is used. 13 samples are used at almost equal intervals.

The residual sulfuric acid content in the cellulose acylate is preferably in the range of 0.1 to 45 mass ppm in terms of sulfur element. They are thought to be contained in salt form. If the content of residual sulfuric acid exceeds 45 mass ppm, it tends to be easily broken at the time of heat stretching or slitting after thermal stretching. The residual sulfuric acid content is more preferably in the range of 1 to 30 mass ppm. The residual sulfuric acid content can be measured by the method specified in ASTM-D817-96.

The free acid content in the cellulose acylate is preferably 1 to 500 mass ppm. If it is in the above range, it is preferable that it is difficult to break as in the above. Further, the free acid content is preferably in the range of 1 to 100 mass ppm, and it is more difficult to break. And particularly preferably in the range of 1 to 70 mass ppm. The free acid content can be determined by the method specified in ASTM-D817-96.

The cellulose acylate thus synthesized is thoroughly washed, whereby the residual sulfuric acid content and the free acid content can be set within the above range, which is preferable.

The cellulose of the raw material of the cellulose acylate is not particularly limited, but cotton linter, wood pulp, kenaf and the like can be mentioned. Further, the cellulose acylates obtained therefrom may be mixed and used in any ratio.

The cellulose acylate can be produced by a known method. Specifically, it can be synthesized by referring to, for example, the method described in Japanese Patent Application Laid-Open No. 10-45804.

The cellulose acylate is also influenced by the trace metal components in the cellulose acylate. These trace metal components are considered to be related to water used in the production process, and it is preferable that few components that can become insoluble nuclei. Particularly, metal ions such as iron, calcium, and magnesium may form an insoluble matter by forming a salt with a polymer decomposition product or the like, which may contain an organic acidic group. In addition, the calcium (Ca) component is apt to form an acidic component such as a carboxylic acid or a sulfonic acid and also a lot of ligands and a coordination compound (i.e., a complex), and a scum derived from a lot of insoluble calcium (insoluble sediments, turbidity ) May be formed.

Specifically, the content of the iron (Fe) component in the cellulose acylate is preferably 1 mass ppm or less. The content of the calcium (Ca) component in the cellulose acylate is preferably 60 mass ppm or less, and more preferably 0 to 30 mass ppm. The content of the magnesium (Mg) component in the cellulose acylate is preferably from 0 to 70 mass ppm, more preferably from 0 to 20 mass ppm, because insoluble matter is generated too much if too large.

The content of the metal component such as the content of the iron (Fe) component, the content of the calcium (Ca) component and the content of the magnesium (Mg) component can be controlled by adjusting the cellulose acylate, Nitric acid, pretreated by alkali melting, and then analyzed using an ICP-AES (inductively coupled plasma emission spectrochemical analyzer).

[Polycarbonate resin]

As the polycarbonate resin, various resins can be used without particular limitation, and aromatic polycarbonate resins are preferable from the viewpoints of chemical properties and physical properties, and bisphenol A polycarbonate resins are particularly preferable. Among them, it is more preferable to use a bisphenol A derivative having a benzene ring, a cyclohexane ring, an aliphatic hydrocarbon group, or the like introduced into bisphenol A. Particularly preferred is a polycarbonate resin having a structure in which the anisotropy in the unit molecule is reduced, obtained by using a derivative in which the functional group is introduced asymmetrically to the central carbon of bisphenol A. Examples of such polycarbonate resins include those obtained by substituting two methyl groups of the carbon at the center of bisphenol A with benzene rings and one hydrogen of each benzene ring of bisphenol A with methyl groups or phenyl groups, A polycarbonate resin obtained by using an asymmetrically substituted polycarbonate resin is particularly preferable.

Specifically, it is obtained from 4,4'-dihydroxydiphenylalkane or a halogen substituent thereof by a phosgene method or an ester exchange method, and examples thereof include 4,4'-dihydroxydiphenyl methane, 4,4'-dihydroxydiphenyl methane, Dihydroxydiphenyl ethane, 4,4'-dihydroxydiphenyl butane, and the like. Further, for example, Japanese Patent Application Laid-Open Nos. 2006-215465, 2006-91836, 2005-121813, 2003-167121, and Japanese Patent Polycarbonate resins described in JP-A-2009-126128, JP-A-2012-31369, JP-A-2012-67300, and WO00 / 26705.

The polycarbonate resin may be used in combination with a transparent resin such as a polystyrene-based resin, a methyl methacrylate-based resin, and a cellulose acetate-based resin. Further, a resin layer containing a polycarbonate resin may be laminated on at least one surface of a resin film formed using a cellulose acetate resin.

The polycarbonate resin preferably has a glass transition point (Tg) of 110 ° C or higher and a water absorption rate (value measured at 23 ° C under water for 24 hours) of 0.3% or lower. It is more preferable that the Tg is 120 ° C or more and the water absorption rate is 0.2% or less.

The polycarbonate resin film that can be used in the present embodiment can be formed by a known method, and the solution casting method or the melt casting method is preferable among them.

<Additives>

The long film of the present embodiment may contain an additive. Examples of the additives include plasticizers, ultraviolet absorbers, retardation-adjusting agents, antioxidants, deterioration inhibitors, release aids, surfactants, dyes, and fine particles. In the present embodiment, the additives other than the fine particles may be added at the time of producing the dope liquid or at the time of producing the fine particle dispersion.

(Plasticizer)

Examples of the plasticizer to be added to the long film include phthalate ester, fatty acid ester, trimellitate ester, phosphate ester, polyester, sugar ester, and acrylic polymer. Among them, plasticizers of polyester series and sugar ester series polymers are preferably used from the viewpoint of moisture permeability.

The polyester-based plasticizer is superior to the phthalate ester-based plasticizer such as dioctyl phthalate in non-planarity and extrusion resistance. Depending on the application, these plasticizers may be selected or used in combination for a wide range of applications. As the acrylic polymer, homopolymers or copolymers of acrylic acid or methacrylic acid alkyl ester are preferable. Examples of the monomer of the acrylic acid ester include methyl acrylate, ethyl acrylate, propyl acrylate (i-, n-), butyl acrylate (n-, i-, s-, t-) , s-), hexyl acrylate (n- and i-), heptyl acrylate (n- and i-), octyl acrylate (n- and i-), nonyl acrylate (n- and i-) and myristyl acrylate -, i-), acrylic acid (2-ethylhexyl), acrylic acid (? -caprolactone), acrylic acid (2-hydroxyethyl), acrylic acid (2- hydroxypropyl) (2-methoxyethyl), acrylic acid (2-ethoxyethyl), and the like, or those obtained by replacing the acrylic acid ester with a methacrylic acid ester have. The acrylic polymer is a homopolymer or a copolymer of the above-mentioned monomers. Preferably, the acryl-based polymer has a methyl acrylate monomer unit content of 30 mass% or more and a methacrylate methyl ester monomer unit content of 40 mass% or more. In particular, homopolymers of methyl acrylate or methyl methacrylate are preferred.

The polyester-based plasticizer is a reaction product of a mono- to tetravalent carboxylic acid and a mono- to hexavalent alcohol, which is obtained mainly by reacting a divalent carboxylic acid with a glycol. Representative divalent carboxylic acids include glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, and sebacic acid. The polyester-based plasticizer is preferably an aromatic-terminal ester-based plasticizer. The aromatic terminal ester plasticizer is preferably an ester compound having a structure obtained by reacting phthalic acid, adipic acid, at least one benzene monocarboxylic acid, and at least one alkylene glycol having 2 to 12 carbon atoms. The structure of the final compound may be an adipic acid residue and a phthalic acid residue as long as it is a structure of the final compound, and may be reacted as an acid anhydride or esterified product of a dicarboxylic acid.

Examples of the benzene monocarboxylic acid component include benzoic acid, para-tert-butylbenzoic acid, orthotoluenic acid, meta-toluic acid, paratoluic acid, dimethylbenzoic acid, ethylbenzoic acid, normalpropylbenzoic acid, aminobenzoic acid, Most preferred is benzoic acid. These may be used alone or as a mixture of two or more kinds.

Examples of the alkylene glycol component having 2 to 12 carbon atoms include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butanediol, 1,3-butanediol, Propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2,2- Propanediol (3,3-dimethylolheptane), 3-methyl-1,5-pentanediol, 1-n-butyl- Hexanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2-methyl-1,8-octanediol, 1,10-decanediol, 1,12-octadecanediol, and the like. Among these, 1,2-propylene glycol is particularly preferable. These glycols may be used alone or as a mixture of two or more thereof.

The aromatic terminal ester plasticizer may be any of oligoester and polyester, and the molecular weight is preferably in a range of from 100 to 10000, and more preferably in a range of from 350 to 3000. The acid value is not more than 1.5 mg KOH / g and the hydroxyl (hydroxyl value) is not more than 25 mg KOH / g, more preferably the acid value is not more than 0.5 mg KOH / g and the hydroxyl (hydroxyl value) is not more than 15 mg KOH / g.

Specific examples thereof include, but are not limited to, the following compounds.

The sugar ester compound is an ester other than a cellulose ester and is a compound obtained by esterifying all or a part of the OH group of a sugar such as the following monosaccharides, 2 sugars, 3 sugars or oligosaccharides. More specific examples are compounds represented by the general formula (4) And compounds to be displayed.

In the formulas, R ₁ to R ₈ represent a hydrogen atom, a substituted or unsubstituted alkylcarbonyl group having 2 to 22 carbon atoms, or a substituted or unsubstituted arylcarbonyl group having 2 to 22 carbon atoms. R ₁ to R ₈ may be the same or different.

Hereinafter, the compound represented by the general formula (4) is more specifically shown (Compound 1-1 to Compound 1-23), but is not limited thereto. In the following table, when the average degree of substitution is less than 8.0, any one of R ₁ to R ₈ represents a hydrogen atom.

The plasticizer is preferably added in an amount of 0.5 to 30 parts by mass based on 100 parts by mass of the cellulose ester film.

(Retardation adjusting agent)

As the compound to be added for adjusting the retardation, an aromatic compound having two or more aromatic rings as described in European Patent No. 911,656A2 can be used.

Two or more kinds of aromatic compounds may be used in combination. It is particularly preferable that the aromatic ring of the aromatic compound contains an aromatic heterocyclic ring in addition to the aromatic hydrocarbon ring. The aromatic heterocycle is generally an unsaturated heterocycle. Among them, 1,3,5-triazine ring is particularly preferable.

(Polymer or oligomer)

The long film of the present embodiment is a film of a vinyl compound having a cellulose ester and a substituent selected from a carboxyl group, a hydroxyl group, an amino group, an amide group and a sulfonic acid group and having a weight average molecular weight of 500 to 200,000 Or an oligomer. The mass ratio of the content of the cellulose ester to the polymer or oligomer is preferably in the range of 95: 5 to 50:50.

(Made by Matt)

In the present embodiment, fine particles as a matting agent can be contained in the long film, whereby it is easy to carry and wind the long film and the long oblique oriented film produced using the same.

It is preferable that the particle size of the mat agent is primary particles or secondary particles of 10 nm to 0.1 占 퐉. A substantially spherical mat material having an aspect ratio of primary particles of 1.1 or less is preferably used.

As the fine particles, those containing silicon are preferable, and silicon dioxide is particularly preferable. Examples of the fine particles of silicon dioxide which are preferable in the present embodiment are Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, OX50 and TT600 (manufactured by Nippon Aerosil Co., Ltd.), and Aerosil 200V, R972, R972V, R974, R202 and R812 can be preferably used. Examples of the fine particles of the polymer include a silicone resin, a fluororesin, and an acrylic resin. Silicone resin is preferable, and it is particularly preferable to have a three-dimensional network structure. Examples of such resins include Tospearl 103, Copper 105, Copper 108, Copper 120, Copper 145, Copper 3120 and Copper 240 (manufactured by Toshiba Silicone Co., Ltd.).

The fine particles of silicon dioxide preferably have a primary average particle diameter of 20 nm or less and an apparent specific gravity of 70 g / L or more. More preferably, the primary particles have an average diameter of 5 to 16 nm, more preferably 5 to 12 nm. The smaller the average diameter of the primary particles, the lower the haze is. The apparent specific gravity is preferably 90 to 200 g / L or more, more preferably 100 to 200 g / L or more. The larger the apparent specific gravity, the more desirable is to make a high-concentration fine particle dispersion, and not to generate haze or agglomerates.

The amount of the matting agent to be added in the present embodiment is preferably 0.01 to 1.0 g, more preferably 0.03 to 0.3 g, and even more preferably 0.08 to 0.16 g per 1 m 2 of the long film.

(Other additives)

Other heat stabilizers such as kaolin, talc, diatomaceous earth, quartz, calcium carbonate, barium sulfate, titanium oxide and alumina, and salts of alkaline earth metals such as calcium and magnesium may be added. Further, a surfactant, a peeling accelerator, an antistatic agent, a flame retardant, a lubricant, an emulsion or the like may be added.

<Characteristics of long film>

(Tension softening point)

The long film of this embodiment is required to withstand use under a higher temperature environment. Therefore, the tensile softening point of the long film is preferably from 105 캜 to 145 캜 because it exhibits sufficient heat resistance, and more preferably from 110 캜 to 130 캜.

As a specific measuring method of the tension softening point, for example, a sample film is cut into 120 mm (length) x 10 mm (width) using a tensile testing machine (RTC-1225A, manufactured by ORIENTEC Co., Ltd.) The temperature is kept at a heating rate of 30 占 폚 / min, the temperature at the time when the temperature is 9N is measured three times, and the average value is obtained.

(Dimensional change rate)

In the case of using the film obtained by obliquely stretching the long film of the present embodiment in an organic EL image display apparatus, problems such as variations in thickness, a change in retardation value, and a reduction in contrast or color irregularity , The dimensional change ratio (%) of the obliquely drawn film is preferably less than 0.5%, more preferably less than 0.3%.

(fault)

It is preferable that the long film of the present embodiment has few defects in the film. Herein, the defect means defects such as voids (foaming defects) in the film caused by rapid evaporation of the solvent in the drying step of the solution film formation, foreign matter (foreign matter defect) in the film due to foreign matter contained in the film forming solution, .

Concretely, it is preferable that defects with a diameter of 5 m or more in the film plane are 1/10 cm square or less. More preferably at most 0.5 / 10 cm square, further preferably at most 0.1 / 10 cm square.

The diameter of the defect refers to the diameter when the defect has a circular shape, and when the defect is not circular, the range of the defect is determined by observing with a microscope by the following method, and the maximum diameter is defined as the diameter of the circumscribed circle.

The range of the defect is the size of the shadow when the defect is observed as the transmitted light of the differential interference microscope when the defect is bubble or foreign matter. When the defect is a change in surface shape such as a transfer of a roll scratch or a scratch, the size is confirmed by observing the defect as reflected light of a differential interference microscope.

In the case of observing with reflected light, if the size of the defect is unclear, aluminum or platinum is deposited on the surface and observed. In order to obtain a film having excellent durability represented by such defect frequency with high productivity, it is necessary to precisely filter the polymer solution immediately prior to pouring, to increase the degree of cleanliness around the pourer, and to set the drying conditions after pouring in a stepwise manner , It is effective to make the drying effective by suppressing foaming.

If the number of defects is more than 1/10 cm square, for example, when a tension is applied to the film at the time of processing in a subsequent process, the film may be broken from the defect as a starting point, and the productivity may be lowered. When the diameter of the defect is 5 mu m or more, the defect can be visually observed by observing the polarizing plate or the like, and a bright spot may be generated when used as an optical member.

(Total light transmittance)

The long film of the present embodiment preferably has a total light transmittance of 90% or more, and more preferably 93% or more. The practical upper limit of the total light transmittance is about 99%. In order to attain excellent transparency expressed by the total light transmittance, it is necessary to prevent introduction of an additive or a copolymerizable component that absorbs visible light or to remove foreign matter in the polymer by high-precision filtration to reduce light diffusion or absorption inside the film . Further, it is possible to reduce the surface roughness of the film contacting portion (cooling roll, calender roll, drum, belt, coating liquid in the solution film forming process, conveying roll, etc.) at the time of film formation to reduce the surface roughness of the film surface, It is effective to reduce reflection.

&Lt; Method for forming long film >

The long film of the present embodiment including the above-described resin can be formed by any of solution casting film forming method and melt casting film forming method described below. Here, the case where the long film includes a cellulose ester-based resin is described, but the same applies to the case where another film is used.

When a long film is prepared by a solution casting method, a dope, which is a raw material solution of a long film of a cellulose ester resin, is softened on a support made of a rotating metal endless belt by a flexible die. The dope film formed on the support by the softening, that is, the web, is peeled off by the peeling roll if the support is about one turn. The peeled web (film) is introduced into a stretching device comprising a tenter.

In the case of producing a long film by a melt flexible film forming method, in the extrusion method using a T die, the polymer is melted at a melting temperature and extruded from a T die into a film type (sheet type) onto a cooling drum, The film is peeled off. The peeled film is introduced into a stretching device made of a tenter.

Hereinafter, the details of each film-forming method will be described.

[Solution flexible film-forming method]

In the method for producing a long film by the solution casting method, the solid content concentration of the dope as the cellulose ester solution is usually about 10 to 40 mass%, and the dope viscosity at the time of the softening in the casting step is in the range of 1 to 200 poise &Lt; / RTI &gt;

Here, first, the cellulose ester is dissolved by a means such as a stirring dissolving method, a heating dissolving method, an ultrasonic melting method and the like in a melting pot. Usually, the cellulose ester is melted in a range where the boiling point of the solvent is higher than the boiling point at normal pressure, , And dissolving with stirring is more preferable because it prevents generation of a massive undissolved product called a gel or agglomerate. Further, the cooling dissolution method disclosed in Japanese Patent Application Laid-Open No. 9-95538 or the method disclosed in Japanese Patent Application Laid-Open No. 11-21379 may be used.

A method in which the cellulose ester is mixed with a poor solvent, wetted or swelled, and further mixed with a two-component agent to dissolve is also preferably used. At this time, an apparatus for mixing cellulose ester with a poor solvent to wet or swell the apparatus and a system for dissolving the cellulose ester by mixing with the two agents may be separately provided.

The kind of the pressurizing container used for dissolving the cellulose ester is not particularly limited, but it is only required to be able to withstand a predetermined pressure, and to heat and stir under pressure. Instrumentation such as a gauge, a pressure gauge, and a thermometer is appropriately placed in the pressure vessel. Pressurization may be performed by a method of pressurizing an inert gas such as nitrogen gas or by raising the vapor pressure of the solvent by heating. Heating is preferably performed from the outside, and for example, a jacket type is preferable because temperature control is easy.

The heating temperature in the case of adding a solvent is not less than the boiling point of the solvent to be used and in the case of two or more kinds of mixed solvents, the temperature is raised to the boiling point of the lower boiling point solvent, . If the heating temperature is too high, the required pressure becomes large and the productivity becomes poor. The preferable range of the heating temperature is from 20 to 120 캜, more preferably from 30 to 100 캜, still more preferably from 40 to 80 캜. Further, the pressure is adjusted so that the solvent does not boil at the set temperature.

In addition to the cellulose ester and the solvent, additives such as necessary plasticizers and ultraviolet absorbers may be previously mixed with the solvent, dissolved or dispersed, and then added to the solvent before the cellulose ester dissolution, or may be added to the dope after the dissolution of the cellulose ester.

After dissolving the cellulose ester, the cellulose ester is taken out of the vessel while being cooled, or extracted from the vessel by a pump or the like, cooled with a heat exchanger or the like, and provided for the dope film formation of the obtained cellulose ester.

When the mixture of the cellulose ester raw material and the solvent is dissolved in the dissolution apparatus having the stirrer, it is preferable that the main stream of the stirring blades is dissolved at least 0.5 m / sec or more and for 30 minutes or more with stirring.

The foreign matter contained in the cellulose ester dope (particularly foreign matter mistakenly recognized as an image in a liquid crystal display device) must be removed by filtration. The quality of the optical film may be determined by this filtration.

If the absolute filtration accuracy is too small, the filter material tends to be clogged, and the filter material must be frequently exchanged to lower the productivity. Therefore, the filter material used for the cellulose ester dope preferably has an absolute filtration accuracy of 0.008 mm or less, more preferably 0.001 to 0.008 mm, and even more preferably 0.003 to 0.006 mm.

The material of the filter medium is not particularly limited and a normal filter medium can be used. However, a filter material made of plastic fibers such as polypropylene or Teflon (registered trademark) or a metal filter material made of stainless steel fibers and the like is preferable .

The filtration of the cellulose ester dope can be carried out by a usual method, but a method of filtration while heating under pressure at a temperature in the range of the boiling point of the solvent at normal pressure and at a temperature not boiling the solvent, ) Is small, which is preferable.

The preferable range of the filtration temperature is 45 to 120 캜, more preferably 45 to 70 캜, still more preferably 45 to 55 캜.

The filtration pressure is preferably 3500 kPa or less, more preferably 3000 kPa or less, and still more preferably 2500 kPa or less. The filtration pressure can be controlled by appropriately selecting the filtration flow rate and the filtration area.

In order to prepare a long film of a cellulose ester resin, a cellulose ester solution (dope) is first prepared by dissolving a cellulose ester in a mixed solvent of a good solvent and a poor solvent, and adding the above plasticizer or ultraviolet absorber.

The dope can be flexible on the support at a temperature of the support in the range of generally 0 ° C to less than the boiling point of the solvent and further flexible on the support in the temperature range of 5 ° C to the solvent boiling point of -5 ° C, Lt; RTI ID = 0.0 &gt; C, &lt; / RTI &gt; At this time, it is necessary to control the surrounding atmosphere humidity to be equal to or higher than the dew point.

If the dope adjusted to have a viscosity of 1 to 200 poises is so flexible as to have a substantially uniform film thickness on the support from the flexible die and the amount of residual solvent in the flexible film is greater than or equal to 200% (Web) is dried by the drying air so that the temperature of the flexible film is in the range of the solvent boiling point + 20 ° C or less until the amount of the residual solvent is 200% or less.

Here, the residual solvent amount can be expressed by the following formula.

Amount of residual solvent (mass%) = {(M-N) / N} 100

In the formula, M is the weight of the web at any point in time, and N is the weight of the weight M when dried at 110 ° C for 3 hours.

On the support, the amount of the residual solvent in the web is preferably dried to 150 mass% or less, more preferably 50 to 120 mass%, in order to dry and solidify the web until it becomes a peelable film strength from the support.

The web temperature at which the web is peeled from the support is preferably 0 to 30 占 폚. In addition, since the temperature of the web rapidly lowers immediately after evaporation of the solvent from the side of the support adhering surface immediately after peeling from the support, and volatile components such as steam and solvent vapor in the atmosphere are easily condensed, the web temperature at peeling is 5 To 30 &lt; 0 &gt; C.

In the drying process of the web (or film), a method of drying while conveying the web by a roll suspension system, a pin tenter system or a clip tenter system is generally employed.

The web after peeling is introduced into, for example, a primary drying apparatus. In the primary drying apparatus, the web is conveyed serially by a plurality of conveying rolls staggered from the side as viewed from the side, during which the web is dried by the hot wind blown from the ceiling of the drying apparatus and discharged from the bottom portion of the drying apparatus do.

Subsequently, the obtained film (sheet) is stretched in the uniaxial direction. The molecules are oriented by stretching. The stretching method is not particularly limited, but a well-known pin tenter or clip-type tenter can be preferably used. The stretching direction may be any direction (oblique direction) in both the longitudinal direction and the width direction, but it is preferable that the elongation of the elongation of the elongate film is easily adjusted by making the elongation direction to be the width direction.

In particular, in the drying step after peeling from the support, the web tends to shrink in the width direction by evaporation of the solvent. The higher the temperature, the greater the shrinkage. It is preferable to dry the film while suppressing the shrinkage as much as possible in order to improve the flatness of the finished film. From this point of view, for example, a method (tenter method) in which the pre-drying step disclosed in Japanese Patent Application Laid-Open No. 62-46625 or a part of steps desirable.

As the elongation condition of the long film, the temperature and the magnification can be selected so that the desired elongation at break characteristic can be obtained. Generally, the stretching magnification is 1.1 to 2.0 times, preferably 1.2 to 1.5 times, and the stretching temperature is usually from -40 占 폚 to Tg + 50 占 폚 of the glass transition temperature (Tg) of the resin constituting the sheet, Lt; RTI ID = 0.0 &gt; 40 C &lt; / RTI &gt; If the stretch ratio is too small, desired stretch elongation characteristics may not be obtained. On the other hand, if the stretch ratio is too large, breakage may occur. If the stretching temperature is too low, it breaks. If the stretching temperature is too high, the desired elongation at break characteristic may not be obtained.

In the case of modifying the breaking elongation property of the thermoplastic resin film produced by the above method to a desired characteristic suited to the purpose, the film may be stretched or shrunk in the longitudinal direction or the width direction. In order to shrink in the longitudinal direction, for example, there is a method in which the width stretching is temporarily clipped out and relaxed in the longitudinal direction, or the transverse stretching device gradually contracts the interval of the adjacent clips to shrink the film. The latter method can be performed by a method in which a common simultaneous biaxial stretching device is used to smoothly and gradually narrow the distance between adjacent longitudinally-extending clips by driving the clip portion with, for example, a pantograph method or a linear drive method.

The holding and stretching by the tenter can be carried out anywhere from 50 to 150% by mass of the film residual solvent immediately after the peeling to 0% by mass of the substantial residual solvent immediately before the winding, but it is preferable that the residual solvent amount is in the range of 5 to 10% .

It is also often common to divide the tenter into several temperature zones in the running direction of the base. The temperature at which the desired physical properties and planarity are obtained is selected as the temperature at the time of stretching. The temperature of the drying zone before and after the tenter may also be selected to be different from the temperature at the time of stretching for various reasons. For example, when the atmospheric temperature of the drying zone before the tenter is different from the temperature in the tenter, it is generally preferable to set the temperature of the zone near the inlet of the tenter to a temperature intermediate the temperature of the drying zone before the tenter and the temperature of the center of the tenter It is being done. Similarly, when the temperature in the tenter aftertenter is different, the temperature of the zone close to the tenter outlet is set to the intermediate temperature between the temperature in the tenter and the temperature in the tenter. The temperature of the drying zone before and after the tenter is generally 30 to 120 DEG C, preferably 50 to 100 DEG C, the temperature of the drawing portion in the tenter is 50 to 180 DEG C, preferably 80 to 170 DEG C, The negative temperature is appropriately selected at their intermediate temperature.

The pattern of the stretching, that is, the trajectory of the gripping clip, is selected from optical properties and planarity of the film as in the case of temperature, and is various. It has a certain width after the start of grinding and is then stretched, It is often used. In the vicinity of the end of the clip grip near the tenter outlet, width reduction is generally performed to suppress the base vibration by opening the grip.

The pattern of stretching is also related to the stretching speed, which is generally in the range of 10 to 1000 (% / min), preferably 100 to 500 (% / min). This stretching speed is not constant when the clip trajectory is a curve, but gradually changes in the running direction of the base.

Further, the web (film) after drying by the tenter system is continuously introduced into the secondary drying apparatus. In the secondary drying apparatus, the web is conveyed serially by a plurality of conveying rolls staggered from the side, while the web is blown from the ceiling of the secondary drying apparatus and discharged from the bottom portion of the secondary drying apparatus And is wound on a winder as a long film of a cellulose ester resin.

As means for drying the web, hot air, infrared rays, heating rolls, microwaves, etc. are generally used without particular limitation. In terms of convenience, it is preferable to dry with hot air. The drying temperature is preferably 40 to 150 占 폚, more preferably 80 to 130 占 폚 in order to improve planarity and dimensional stability.

Thus, in the web drying step, the web peeled from the support is further dried, and finally the amount of the residual solvent is adjusted to 3 mass% or less, preferably 1 mass% or less, more preferably 0.5 mass% or less Is preferable for obtaining a film having good dimensional stability.

These processes from the softening step to the post-drying step may be performed in an air atmosphere or under an inert gas atmosphere such as nitrogen gas. In this case, it goes without saying that the drying atmosphere is carried out in consideration of the explosive limit concentration of the solvent.

In addition, a process for forming embossing on both side edges of a long film of a cellulose ester resin by an embossing device at a stage preceding the introduction of the long film of the cellulose ester resin finished in the conveyance drying step into the winding step . As the embossing apparatus, for example, an apparatus described in Japanese Patent Application Laid-Open No. 63-74850 can be used.

The winding machine relating to the production of a cellulose ester resin-based long film can be wound by a winding method such as a normal tension method, a constant torque method, a taper tension method and a program tension control method with a constant internal stress .

The film thickness of the long film after winding is different depending on the purpose of use. The film thickness is in the range of 20 to 200 占 퐉, and in consideration of the recent thinning, it is preferably in the range of 30 to 120 占 퐉, Range is preferred.

[Melting flexible film forming method]

Examples of the melt soft-film-forming method include a melt-extrusion method such as a method using a T-die or an inflation method, a calendering method, a hot pressing method, and an injection molding method. Among them, a method using a T-die, which is small in thickness unevenness, easy to be processed to a thickness of about 50 to 500 탆, and capable of reducing unevenness in film thickness and unevenness of retardation, is preferable. The extrusion method using a T die is a method in which a polymer is melted at a melting temperature and extruded from a T die into a film type (sheet type) onto a cooling drum, cooled and solidified, and peeled off from the cooling drum. And can be preferably used.

The melt extrusion can be carried out under the same conditions as those used for other thermoplastic resins such as polyester. For example, the cellulose ester which has been dried under a hot air or a vacuum or a reduced pressure is melted at an extrusion temperature of about 200 to 300 ° C by using a uniaxial or biaxial extruder, filtered with a filter of a leaf disc type, , Flexible from a T-die to a film (sheet), and solidified on a cooling drum. When introduced into the extruder from the feed hopper, it is preferable to prevent the oxidative decomposition or the like under an atmosphere of reduced pressure or inert gas.

The extrusion flow rate is preferably stably performed by introducing a gear pump. In addition, a stainless steel fiber sintered filter is preferably used as a filter used for removing foreign matters. The stainless steel fiber sintering filter is obtained by forming a state in which the stainless steel fiber sieve is intricately intertwined with each other, compressing the sintered stainless steel fiber sieve, and sintering the contact portions so as to integrate them. The filtration accuracy can be adjusted by changing the density depending on the thickness of the fibers and the amount of compression . It is preferable that the filtration precision is a multilayer body obtained by repeating a plurality of times continuously by a coarse and a mill. In addition, it is preferable to adopt a configuration in which the filtration accuracy is gradually increased, or a method of repeating the setting and filtering of the filtration accuracy is adopted, so that the filtration life of the filter is extended and the replenishment accuracy of foreign matters and gels can be improved.

When scratches or foreign matter adhere to the die, a stripe-like defect may occur. Such a defect is called a die line. In order to reduce defects on the surface of a die line or the like, it is preferable that the pipe from the extruder to the die has a structure in which the retention portion of the resin is minimized. In addition, it is preferable to use the die without any scratches or the like on the inside or the lip of the die. The volatile component is precipitated from the resin around the die, which may cause die lines. Therefore, it is preferable to suck the atmosphere containing the volatile component. In addition, since it may precipitate in an apparatus such as an electrostatic attraction, it is preferable to apply alternating current or prevent precipitation by another heating means.

Additives such as plasticizers may be mixed with the resin in advance, or may be put in the middle of the extruder. In order to uniformly add it, it is preferable to use a mixing device such as a static mixer.

The temperature of the cooling drum is preferably not higher than the glass transition temperature of the thermoplastic resin. In order to adhere the resin to the cooling drum, it is preferable to use a method of tightly adhering to the cooling drum by static electricity, a method of closely adhering by wind pressure, a method of tightly adhering to the entire width or end portion,

Unlike the long film formed by the solution softening method, the long film of the thermoplastic resin molded by the melt softening film forming method has a feature that the retardation in the thickness direction (Rt) is small and the stretching condition different from the solution casting film forming method Sometimes it becomes necessary. In some cases, stretching in the film advancing direction and stretching in the film width direction are performed simultaneously or sequentially in order to obtain desired optical properties. In some cases, the film may be stretched only in the film width direction. The molecules are oriented by this stretching operation, and the film is adjusted to a necessary retardation value.

When the long film of the present embodiment is produced by the melt soft film forming method, the ultraviolet absorbing agent that can be used may be substantially the same as that used in the above-mentioned method for producing a long film by the solution casting film forming method.

The blending amount of the ultraviolet absorber is preferably 0.01 to 10 mass%, more preferably 0.1 to 5 mass% with respect to the thermoplastic resin. If the amount is too small, the ultraviolet absorbing effect may be insufficient. On the other hand, if the amount is too large, the transparency of the film may be deteriorated. The ultraviolet absorber preferably has high thermal stability.

For the long film, it is preferable to add fine particles for imparting slipperiness of the film. As the fine particles to be used, any of inorganic compounds or organic compounds may be used as long as it has heat resistance at the time of melting. Examples of inorganic compounds include silicon-containing compounds, silicon dioxide, aluminum oxide, zirconium oxide, calcium carbonate, talc, Clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate are preferable, and an inorganic compound containing zirconium or zirconium oxide is more preferable. Among them, silicon dioxide is particularly preferably used because it is possible to suppress the haze to a small degree. Even when a long film is produced by the melt soft film forming method, as the matting agent to be used, substantially the same materials as those used in the method for producing a long film by the solution casting film forming method can be used.

<Specification of long film>

The thickness of the long film in this embodiment is preferably 1 to 400 占 퐉, preferably 20 to 200 占 퐉, more preferably 30 to 120 占 퐉, particularly preferably 40 to 100 占 퐉.

The width of the long film is not particularly limited, but may be 500 to 4000 mm, preferably 1000 to 2000 mm.

The preferable modulus of elasticity at the stretching temperature at the time of oblique stretching of the long film is expressed by the Young's modulus and is from 0.01 MPa to 5000 MPa, more preferably from 0.1 MPa to 500 MPa. When the modulus of elasticity is too low, the shrinkage ratio after stretching is lowered, and wrinkles are less likely to disappear. When the modulus of elasticity is too high, the tensile force at the time of stretching increases, and it is necessary to increase the strength of the portion holding the both side edges of the film, and the load on the tenter in the subsequent process is increased.

As the long film, an unoriented film may be used, or a film having a predetermined orientation may be supplied. Further, if necessary, the distribution of the orientation of the long film in the width direction may be bowed, or so-called bowing. The orientation of the long film can be adjusted so that the orientation of the film at the position where the drawing of the subsequent process is completed is desired.

&Lt; Method for producing slant oriented film &

Next, a description will be given of a method and a device for producing an oblique oriented film, in which the long film described above is stretched in an oblique direction with respect to the width direction to produce a long obliquely oriented film (obliquely stretched film).

&Lt; Optical film production method and apparatus >

Then, the above-mentioned long film is stretched in the oblique direction with respect to the width direction to prepare a long obliquely-oriented film, and both end portions in the width direction of the obliquely-oriented film are cut off and the remaining product portion is obtained as an optical film. A manufacturing method and a manufacturing apparatus of the present invention will be described.

(Overview of the device)

1 is a plan view schematically showing a schematic configuration of an optical film production apparatus 1. The manufacturing apparatus 1 comprises a film feed portion 2, a transport direction changing portion 3, a guide roll 4, a stretching portion 5, and a guide roll 6, a transport direction changing section 7, a film cutting apparatus 8, and a film winding section 9. Details of the stretching portion 5 and the film cutting device 8 will be described later.

The film feeding portion 2 uncovers the long film and feeds it to the stretching portion 5. The film feeder 2 may be formed separately from the film forming apparatus of the long film, or may be integrally formed. In the case of the former, a long film is taken out from the film feeding portion 2, and then a long film is taken out from the film feeding portion 2 by winding the long film on the winding core once and winding it up. On the other hand, in the latter case, after the long film is formed, the film feeding portion 2 is fed to the stretching portion 5 without winding the long film.

The transport direction changing section 3 changes the transport direction of the long film fed out from the film feeding section 2 to the direction toward the entrance of the stretching section 5 as the warp stretching tent. The transport direction changing portion 3 includes a turn bar for changing the transport direction by folding while transporting the film, for example, and a rotary table for rotating the turn bar in a plane parallel to the film.

By changing the conveying direction of the long film in the conveying direction changing section 3 as described above, the width of the entire manufacturing apparatus 1 can be made narrower, and besides, the conveying position and angle of the film can be finely controlled And it becomes possible to obtain a long obliquely-oriented film having a small variation in film thickness and optical value. When the film feeding portion 2 and the conveying direction changing portion 3 are movable (slidable and swivelable), the right and left clips It is possible to effectively prevent the sticking defects of the film on the film.

The film feeding portion 2 may be slidable and pivotable so as to feed a long film at a predetermined angle with respect to the entrance of the stretching portion 5. In this case, it is also possible to adopt a configuration in which the installation of the transport direction changing section 3 is omitted.

At least one guide roll 4 is provided on the upstream side of the stretching portion 5 in order to stabilize the trajectory during traveling of the long film. Further, the guide roll 4 may be constituted by a pair of upper and lower pairs of rolls sandwiching the film, or a pair of rolls. The guide roll 4 closest to the entrance of the stretching portion 5 is a driven roll for guiding the running of the film and is rotatably supported by a bearing portion (not shown). As the material of the guide roll 4, known rollers can be used. Further, in order to prevent scratches on the film, it is preferable to reduce the weight of the guide roll 4 by applying a ceramic coating to the surface of the guide roll 4, or chrome plating the light metal such as aluminum.

It is preferable that one of the rolls on the upstream side of the guide roll 4 closest to the entrance of the stretching section 5 is nipped by pressing the rubber roll. By using such a nip roll, it is possible to suppress variations in the tension force in the film flow direction.

A pair of bearing portions at both ends (right and left) of the guide roll 4 closest to the entrance of the stretching portion 5 are provided with a film tension detecting device for detecting a tension generated in the film in the roll, A tension detecting device, and a second tension detecting device are provided, respectively. As the film tension detecting device, for example, a load cell can be used. As the load cell, a known type of tensile or compression type can be used. The load cell is a device for converting a load acting on a point of contact into an electric signal by a strain gauge provided on the strain inducing body and detecting the load.

The load cell is provided at the left and right bearing portions of the guide roll 4 closest to the entrance of the stretching portion 5 so that the force applied to the roll by the film during running, And independently detects the tension in the left and right directions. Further, a strain gauge may be directly provided on a support constituting a bearing portion of the roll, and a load, that is, a film tension may be detected on the basis of deformation occurring in the support. The relationship between the generated deformation and the film tension is measured in advance and assumed to be known.

When the position and the conveying direction of the film supplied from the film feeding portion 2 or the conveying direction changing portion 3 to the stretching portion 5 are deviated from the position toward the entrance of the stretching portion 5 and the conveying direction, A difference occurs in the tension in the vicinity of both side edge portions of the film in the guide roll 4 closest to the entrance of the stretching portion 5 depending on the amount of displacement. Therefore, by detecting the tension difference by installing the film tension detecting device as described above, it is possible to determine the degree of the deviation. That is, when the transporting position and the transporting direction of the film are appropriate (the position and direction toward the inlet of the stretching portion 5), the load acting on the guide roll 4 becomes substantially equal at both ends in the axial direction, Otherwise, difference in film tension occurs between right and left.

Therefore, in order to equalize the difference in film tension between the left and right sides of the guide roll 4 closest to the entrance of the stretching section 5, for example, the position of the film and the conveying direction (stretching section 5) is appropriately adjusted, it is possible to stabilize the holding of the film by the wave-like earth at the entrance portion of the stretching portion 5, and to reduce the occurrence of disturbance such as wave-like earth shift. In addition, it is possible to stabilize the physical properties of the film in the width direction after the warp stretching by the stretching portion (5).

At least one guide roll 6 is provided on the downstream side of the stretching section 5 in order to stabilize the trajectory at the time of running of the obliquely stretched film in the stretching section 5.

The carrying direction changing section 7 changes the carrying direction of the film after being drawn from the stretching section 5 in the direction toward the film winding section 9.

Here, in order to cope with the fine adjustment of the orientation angle (the direction of the in-plane slow axis of the film) and the product variation, the progress of the film at the entrance of the stretching part 5 and the progress of the film at the exit of the stretching part 5 It is necessary to adjust the angle formed by the direction. In order to adjust the angle, the direction in which the formed film is moved is changed by the carrying direction changing section 3 to guide the film to the entrance of the stretching section 5 and / or the film from the exit of the stretching section 5 It is necessary to change the traveling direction of the film by the carrying direction changing section 7 and return the film to the direction of the film winding section 9.

In addition, it is preferable to continuously perform film formation and warp stretching in terms of productivity and yield. When the film forming process, the warp stretching process, and the winding process are continuously performed, the film advancing direction is changed by the carrying direction changing section 3 and / or the carrying direction changing section 7, As shown in Fig. 1, the moving direction of the film fed from the film feeding portion 2 and the moving direction of the film immediately before being wound by the film winding portion 9 (Winding direction), the width of the entire device in the film advancing direction can be made small.

It is not necessary that the film advancing direction in the film forming process and the winding process necessarily coincides with each other but the direction of the film carrying section 2 and the film winding section 9 is not interfered, Or the carrying direction changing portion 7 to change the traveling direction of the film.

The above-described transport direction changing unit 3 · 7 can be realized by a known method such as using an air flow roll or an air turn bar.

The film take-up portion 9 is for winding a film (optical film) to be conveyed from the stretching portion 5 through the conveying direction changing portion 7 and the film cutting device 8 and includes, for example, , A drive device, and the like. It is preferable that the film take-up portion 9 is a structure that can slide in the lateral direction to adjust the winding position of the film.

The film take-up portion 9 is capable of finely controlling the take-in position and angle of the film so that the film can be pulled at a predetermined angle with respect to the exit of the stretching portion 5. [ As a result, it becomes possible to obtain a long oblique oriented film having small variations in film thickness and optical value. In addition, the occurrence of wrinkles of the film can be effectively prevented, and the winding-up property of the film is improved, so that the film can be wound up a long time.

The film take-up portion 9 constitutes a pulling portion for pulling the film to be stretched by the stretching portion 5 with a predetermined tension. Between the stretching portion 5 and the film take-up portion 9, a take-up roll for pulling the film with a constant tension may be provided. The guide roll 6 described above may have a function as the take-up roll.

In the present embodiment, it is preferable that the film pulling tension T (N / m) after stretching is adjusted within a range of 100 N / m <T <300 N / m, preferably 150 N / m <T <250 N / m. If the pulling tension is 100 N / m or less, loosening or wrinkling of the film tends to occur, and the profile of the retardation and orientation angle in the film width direction is also deteriorated. On the contrary, when the pulling tension is 300 N / m or more, the variation of the orientation angle in the film width direction is deteriorated and the width yield (acquisition efficiency in the width direction) is deteriorated.

In the present embodiment, it is preferable to control the fluctuation of the take-up tension T at an accuracy of less than ± 5%, preferably less than ± 3%. If the fluctuation of the take-up tension T is ± 5% or more, fluctuation of the optical characteristics in the width direction and the flow direction (transport direction) becomes large. As a method of controlling the fluctuation of the take-up tension T within the above range, the load applied to the first roll (guide roll 6) on the exit side of the stretching portion 5, that is, the tensile force of the film is measured, A method of controlling the rotational speed of the take-up roll of the take-up roll or the film take-up portion 9 by a general PID control method may be mentioned. As a method for measuring the load, there is a method in which a load cell is provided on the bearing portion of the guide roll 6 and the load applied to the guide roll 6, that is, the tensile force of the film is measured. As the load cell, a known type of tensile type or compression type can be used.

Before winding the long optical film, for the purpose of preventing blocking between the films, the masking film may be overlaid on the optical film and wound at the same time, or may be wound on at least one (preferably both) of the optical films overlapping by winding Tape or the like may be wound while being joined. The masking film is not particularly limited as long as it can protect the optical film, and examples thereof include a polyethylene terephthalate film, a polyethylene film, and a polypropylene film.

Further, before winding the optical film, a portion (projection) bulging more than the film surface, which is called a burring portion or an embossing portion, is formed at both end portions in the width direction of at least one surface (preferably both surfaces) Blocking of the films when the film is wound up may be prevented. Further, the height and shape of the knurled portion may be different at both end portions in the width direction (may be asymmetric).

(Details of extension section)

Next, the elongating unit 5 will be described in detail. Fig. 2 is a plan view schematically showing an example of the rail pattern of the extending portion 5. Fig. However, this is merely an example, and the configuration of the extending portion 5 is not limited to this.

In the present embodiment, a tenter (tapered stretching machine) capable of warp stretching is used as the stretching portion 5. This tenter is a device for heating a long film to an arbitrary stretchable temperature and obliquely stretching it. This tenter is constituted by a plurality of wave cores Ci · Co (only a pair of gripping regions in FIG. 2) running along the heating zone Z, a pair of right and left rails Ro · Ro and a rail Ri · Ro, . Details of the heating zone Z will be described later. Each of the rails Ri and Ro is formed by connecting a plurality of rail portions by connecting portions (the white circle in Fig. 2 is an example of a connecting portion). The wave earth Ci · Co is constituted by a clip holding both ends in the width direction of the film.

In Fig. 2, the elongating direction D1 of the long film is different from the elongating direction D2 of the optical film after elongating, and forms the elongating angle &amp;thetas; i with the elongating direction D2. The feed angle? I can be set arbitrarily at a desired angle in a range exceeding 0 ° and less than 90 °.

As described above, since the feeding direction D1 and the winding direction D2 are different from each other, the rail pattern of the tenter is asymmetrical in the right and left directions, and the conveying path of the film is curved in the middle. The rail pattern can be manually or automatically adjusted in accordance with an orientation angle?, A stretching magnification factor, and the like applied to a long oblique orientation film to be produced. In the warp stretching machine used in the manufacturing method of the present embodiment, it is preferable that the positions of the rail portions and the rail connecting portions constituting the rails Ri and Ro are freely set and the rail pattern can be arbitrarily changed.

In the present embodiment, the plurality of wave cores Ci · Co of the tenter are arranged to be spaced apart from the front and rear wave cores Ci · Co and run at a constant speed. The traveling speed of the wave earth Ci · Co can be appropriately selected, but is usually 1 to 150 m / min. In the present embodiment, in consideration of the productivity of the film, it is preferably 20 to 100 m / min. The difference in travel speed between the pair of left and right wave windings Ci · Co is usually 1% or less, preferably 0.5% or less, more preferably 0.1% or less of the traveling speed. This is because if there is a difference in traveling speed between the left and right sides of the film at the exit of the stretching process, wrinkles or unevenness at the exit of the stretching process occurs, and therefore the speed difference between the left and right wave regions Ci and Co is required to be substantially the same . In a general tentering machine or the like, there is a speed non-uniformity occurring on the order of seconds or less depending on the tooth period of the sprocket for driving the chain, the frequency of the drive motor, and the like. Often several percent of the unevenness is generated. This does not apply to the speed difference.

In the warp stretcher used in the production method of the present embodiment, a rail for regulating the trajectory of the crushing strip is often required to have a large bending rate, particularly at a position where the conveyance of the film is inclined. For the purpose of avoiding interference between waveguides due to abrupt bending or local concentration of stress, it is desirable to make the locus of the waveguide curved at the bent portion.

As described above, the oblique stretching tenters used for imparting the oblique directional orientation to the long film can freely set the orientation angle of the film by variously changing the rail pattern, and the orientation axis of the film ) Can be oriented horizontally evenly and precisely over the film width direction and the tenter can control the film thickness and retardation with high precision.

Next, the drawing operation in the stretching section 5 will be described. Both ends of the long film are gripped by the left and right wave regions Ci · Co, and are conveyed in the heating zone Z with traveling of the wave earth Ci · Co. The left and right wave regions Ci 占 상대 r are opposed to each other in a direction substantially perpendicular to the traveling direction (feeding direction D1) of the film at the entrance portion (position A in the drawing) of the stretching portion 5, And runs on the rails Ri and Ro, respectively, and releases the film gripped by the exit portion (the position of B in the figure) at the end of drawing. The film which is opened from the wave region Ci · Co is wound on the winding core in the film winding section 9 described above. The pair of rails Ri and Ro each have an endless continuous trajectory and the waveguide Ci · Co that opens the grip of the film at the outlet of the tenter travels the outer rail and returns to the inlet .

At this time, since the rail Ri 占 is asymmetric in the left and right directions in the example of Fig. 2, the left and right waveguides Ci 占 상대 oc opposing to the position A in the figure move on the rails Ri 占 side And the waveguide Ci running on the side of the sunroof (inboard side) becomes the preceding positional relation to the waveguide Co running on the rail Ro side (outcourse side).

That is, when one waveguide Ci first arrives at the position B at the end of the stretching of the film out of the waveguide Ci 占 Co, which has been opposed in the direction substantially perpendicular to the feeding direction D1 of the film at the position A in the figure, The straight line connecting the regions Ci and Co is inclined at an angle &amp;thetas; L with respect to a direction substantially perpendicular to the winding direction D2 of the film. By the above operation, the long film is obliquely elongated at the angle of? L with respect to the width direction. Here, the term &quot; substantially perpendicular &quot;

In the oblique stretching process, the transporting speed of the film may be 1 to 150 m / min. From the viewpoint of improving the productivity of the film, the transporting speed of the film is preferably 10 to 120 m / min, more preferably 20 to 100 m / min.

Next, the details of the heating zone Z will be described. The heating zone Z of the stretching section 5 is composed of a preheating zone Z1, a stretching zone Z2 and a relaxation zone Z3. In the stretching section 5, the film held by the waveguide Ci 占 폚 passes through the preheating zone Z1, the stretching zone Z2, and the relaxation zone Z3 in this order. In the present embodiment, the preheating zone Z1 and the stretching zone Z2 are partitioned by partition walls, and the stretching zone Z2 and the relaxation zone Z3 are partitioned by partition walls. Further, partition walls may be appropriately provided in the respective zones of the preheating zone Z1, the stretching zone Z2, and the relaxation zone Z3 (the inside of each zone may be further divided into partitions).

The preheating zone Z1 is a zone in which, at the entrance of the heating zone Z, the waveguide Ci 占 한 peewith holding both ends of the film travels with left and right spacing (in the film width direction).

The stretching zone Z2 is a zone from when the interval between the waveguides Ci and Co holding the both ends of the film starts to spread to a predetermined interval. At this time, oblique stretching is performed as described above, but if necessary, stretching may be performed in the longitudinal direction or the transverse direction before and after the oblique stretching.

The relaxation zone Z3 is a zone in which a relaxation step is performed to relax the stress (residual stress) remaining on the film by oblique stretching after the oblique stretching step in the stretching zone Z2 by setting a temperature to be described later. In the relaxation zone Z3, the relaxation zone Z3 is also referred to as a heat-fixing zone in that the optical axis (slow axis) of the obliquely-stretched film is fixed. In the relaxation zone Z3, the wave zones Ci and Co at both ends may be run parallel to each other, or the film may be shrunk in the width direction and then run in parallel. Either way, in the relaxation zone Z3, the transport path of the film is not bent as in the warp stretching zone Z2-2, and the transport direction of the film is constant.

Further, the stretched film may pass through a zone (cooling zone) where the temperature in the zone is set to be equal to or lower than the glass transition temperature Tg (占 폚) of the thermoplastic resin constituting the film after passing through the relaxation zone Z3.

The temperature of the preheating zone Z1 is from Tg to Tg + 60 占 폚, the temperature of the stretching zone Z2 is from Tg to Tg + 50 占 폚, the temperature of the relaxation zone Z3 and the cooling zone is from Tg-40 to Tg + 30 &lt; 0 &gt; C.

The length of the preheating zone Z1, the stretching zone Z2, and the relaxation zone Z3 can be appropriately selected. The length of the preheating zone Z1 is usually 50 to 200% and the length of the relaxation zone Z3 is usually 50 to 150 %to be.

When the width of the film before stretching is W0 (mm) and the film width after stretching is W (mm), the stretch ratio R (W / W0) in the stretching step is preferably 1.1 to 3.0, Is 1.3 to 2.0. When the stretching magnification falls within this range, thickness irregularity in the width direction of the film becomes small, which is preferable.

The method of oblique stretching in the stretching section 5 is not limited to the above-mentioned method. For example, as disclosed in Japanese Patent Application Laid-Open No. 2008-23775, by simultaneous biaxial stretching The oblique stretching may be performed. Simultaneous biaxial stretching is a method of grasping both end portions of a supplied long film in the transverse direction by each waveguide and transporting the long film while moving each wave earth while keeping the longitudinal direction of the long film constant , A method of stretching a long film in an oblique direction with respect to the width direction by making the moving speed of one wave earth different from the moving speed of the other wave earth. In addition, the oblique stretching may be carried out by a method as disclosed in Japanese Patent Laid-Open Publication No. 2011-11434.

(Details of film cutting apparatus)

Next, the details of the film cutting apparatus 8 will be described. Fig. 3 is a perspective view showing a schematic configuration of the film cutting apparatus 8. Fig. The film cutting device 8 is provided with a first cut portion (not shown) for cutting both end portions in the width direction of the long oblique orientation film F 'obliquely stretched in the stretching portion 5, that is, one end portion Ta and the other end portion Tb along the longitudinal direction 8a and a second cut portion 8b. The end portion Ta and the other end portion Tb are cut off and removed from the long oblique orientation film F 'by the first cut portion 8a and the second cut portion 8b so that the remaining film between the end portion Ta and the end portion Tb in the width direction (Product part) can be obtained as the optical film F. The cut ends Ta and Tb are recovered as a trim portion to a shooter (not shown) and reused for film formation of the next film. The positions of the first cut portion 8a and the second cut portion 8b in the width direction are adjusted in accordance with the width of the optical film F to be obtained.

Fig. 4 is a plan view of the film cutting apparatus 8. Fig. The first cut portion 8a and the second cut portion 8b each have an upper blade 10a (second blade) and a lower blade 10b (first blade). The lower blade 10b is a rotary blade which is disposed on one side (for example, the lower side) with respect to the film surface of the long oblique orientation film F 'and rotates about the rotation axis 10b ₁ located along the width direction. The upper blade 10a is a rotary blade disposed on the other side (for example, the upper side) with respect to the film surface of the long oblique orientation film F '. The rotary shaft 10a ₁ of the upper blade 10a is inclined with respect to the width direction by an angle corresponding to the toe angle? 1 (?) With respect to the lower blade 10b in the film plane. The toe angle refers to the angle formed by the upper edge 10a and the lower edge 10b in the film plane.

When the long oblique orientation film F 'is transported to the film cutting device 8, the long oblique orientation film F' is transported to the upper edge 10a at the position (slitting point) where it is stuck to the upper edge 10a and the lower edge 10b, And the lower blade 10b. By cutting the long oblique oriented film F 'while transporting it in the longitudinal direction, the long oblique oriented film F' is cut along the longitudinal direction. As described above, in the film cutting apparatus 8, the cutting step of cutting both end portions in the width direction of the long oblique orientation film F 'by the first cut portion 8a and the second cut portion 8b is performed.

Here, in the cutting step, the positional relationship between the upper blade 10a and the lower blade 10b is set in each of the first cut portion 8a and the second cut portion 8b as described below, and the long oblique orientation film F '. That is, the toe angle of the lower edge 10b with respect to the lower edge 10b in one of the widthwise direction (film center side and film inner side) and the other side (opposite to the film center side, film outer side) As the upper blade 10a is tilted in the direction in which? 1 increases, the angle? formed by the plane S forming the toe angle? 1 of the upper blade 10a and the orientation direction of the long oblique orientation film F ' The blade 10a is arranged. Further, the angle? Is in the range of 0 占 <? <90 占. In the example shown in Fig. 4, the side on which the angle &amp;thetas; becomes smaller is the first cut portion 8a that cuts the left end Ta of the long oblique orientation film F ' (On the inner side of the film) of the long oblique orientation film F ', and on the second cut portion 8b that cuts the right end Tb of the long oblique orientation film F'. In the cutting step, the upper blade 10a and the lower blade 10b are arranged as described above to sandwich the long oblique orientation film F 'to cut the long obliqual oriented film F'.

5 is a plan view of the film cutting apparatus 8 'of the reference example. 4, except that the positional relationship between the lower blade 10b and the upper blade 10a in the width direction in the second cut portion 8b is reversed from that in Fig. 4, Is the same as the film cutting device 8 of Fig. That is, in the reference example, the upper blade 10a is arranged on the film center side with respect to the lower blade 10b in the second cut portion 8b and the toe angle? 1 is set on the film center side between the lower blades 10b , And a long oblique orientation film F 'is interposed between the upper blade 10a and the lower blade 10b and cut. In addition, the absolute value of the tow angle [theta] 1 is the same in Figs. 4 and 5.

In the reference example, in the second cut portion 8b, the direction along the plane S of the upper blade 10a is a direction intersecting the alignment direction of the long oblique orientation film F '. If the orientation angle of the long obliquely oriented film F '(the angle formed by the orientation direction with respect to the width direction) is φ (°), the direction along the plane S and the orientation direction The angle? Formed by this is? = (90? -Φ) +? 1. As described above, when the angle? Is large, the oblique orientation of the long oblique orientation film F 'becomes a large resistance at the time of the oblique stretching along the longitudinal direction by the second cut 8b, 'Are easily repelled in the alignment direction relative to the second cut portion 8b (the upper blade 10a and the lower blade 10b). As a result, the long oblique orientation film F 'is deteriorated in the state of being cut off, so that whiskers and fluffs are generated at the end (cut portion), and at the same time, the optical film F is easily broken at the time of cutting.

4, in the first cut portion 8a and the second cut portion 8b, the direction along the plane S of the upper blade 10a in the film plane and the direction along the longer slanted orientation film F (90 DEG -φ) -? 1, which is smaller than the angle? Of FIG. 5 (reference example). 4, the upper blade 10a is located on the side closer to the orientation direction of the long oblique orientation film F 'with respect to the lower blade 10b in the width direction. Therefore, 5.

As described above, since the long blade oriented film F 'is cut by positioning the upper blade 10a closer to the alignment direction, the resistance at the time of cutting due to the orientation in the oblique direction of the long warped oriented film F' 5, it can be suppressed that the long oblique orientation film F 'is prevented from being repelled in the alignment direction relative to the first cut portion 8a and the second cut portion 8b at the time of cutting . As a result, it is possible to improve the cutting state of the long oblique orientation film F ', thereby suppressing occurrence of whiskers and fluffs at the ends, and also to suppress the breakage of the optical film F at the time of cutting. In addition, since the long oblique orientation film F 'can be prevented from being repelled in the alignment direction at the time of cutting, it is possible to suppress the meandering of the optical film after the cutting, align the winding end face when the optical film is wound, The shape can be improved.

Incidentally, the long oblique orientation film of the present embodiment may be a long obliquely stretched film which is elongated in the oblique direction with respect to the width direction by feeding a long film out of the rolled long film. The oscillation winding is a method in which at least one of the winding core and the film is periodically vibrated (oscillated) in the width direction and the film is wound on the winding core. This oscillation winding is performed for the purpose of reducing the blocking (sticking of films between each other) of the wound film and the black band (band stripes in the circumferential direction).

The oscillated long film has a minute film thickness deviation at the end in the width direction. This is because, in the winding state, at the position where the end portion of the long film is projected toward the winding core, the film is not pressed by the upper and lower films, This is because the presence or absence of such pressing is caused by a difference in film thickness.

When the film thickness of the film to be cut varies in the cutting position (slitting point) between the upper blade 10a and the lower blade 10b, due to the fluctuation of the film thickness, It becomes easier to bounce off. Therefore, by arranging the upper blade 10a and the lower blade 10b as shown in FIG. 4, it is possible to reduce the elasticity of the long oblique orientation film F 'in the alignment direction at the time of cutting, The cutting method of the embodiment is very effective when the long oblique oriented film is a long obliquely stretched film obtained by obliquely stretching a long film having an oscillation wound therein.

Further, since the alicyclic olefin polymer-based resin has a lower embrittlement than cellulose ester-based resin, it is prone to be broken and a fluffy yarn is likely to be generated at the cut portion, and breakage of the optical film F easy to do. Thus, in the above-described cutting method of the present embodiment, which can improve the cut state of the long oblique orientation film F ', the long obliquely-oriented film includes the alicyclic olefin polymer resin, and both ends of the long obliquely- , It becomes very effective.

Further, the tow angle? 1 shown in FIG. 4 may be appropriately set, for example, between 0 ° <θ1 <1 °. The angle? 2 of the blade edge of the upper blade 10a may be appropriately set between 30 ° and 60 °, for example.

Further, in the above, the rotary shaft and the lower edge (10b) as a first edge (10b ₁₎ arranged so as to follow the width direction, and the axis of rotation of the upper edge (10a) as a second edge (10a ₁₎ is tilted with respect to the width direction The upper blade 10a may be arranged so that the rotary shaft 10a ₁ is arranged along the width direction and the lower blade 10b is arranged so that the rotary shaft 10b ₁ is inclined with respect to the width direction . That is, the upper blade 10a may be treated as the first blade, and the lower blade 10b may be treated as the second blade.

&Lt; Quality of long warp oriented film >

In the long oblique orientation film of the present embodiment, the orientation angle? Is inclined to a range of, for example, greater than 0 ° and less than 90 ° with respect to the winding direction. In the width of at least 1300 mm, It is preferable that the variation of Ro is 2 nm or less and the variation of the orientation angle is less than 0.6 DEG. Further, the in-plane retardation value Ro (550) of the long oblique orientation film measured at a wavelength of 550 nm is preferably in the range of 80 nm to 160 nm, more preferably 90 nm to 150 nm.

That is, in the long oblique orientation film of the present embodiment, the fluctuation of the in-plane retardation Ro is preferably 2 nm or less and 1 nm or less at 1300 mm in the width direction. When the variation of the in-plane retardation Ro is in the above range, a long optical film obtained from the long oblique orientation film is bonded to the polarizer to form a circularly polarizing plate. When this is applied to an organic EL image display apparatus, It is possible to suppress color unevenness due to leakage of the ink. In addition, when the optical film is used as a retardation film for a liquid crystal display device, for example, the display quality can be made good.

In the long oblique orientation film of the present embodiment, the variation of the orientation angle? Is preferably less than 0.6 deg., Preferably less than 0.4 deg., And most preferably less than 0.2 deg. At at least 1300 mm in the width direction. When the optical film having the variation of the orientation angle? Exceeding 0.6 degrees is bonded to a polarizer to form a circularly polarizing plate and this is provided in an image display apparatus such as an organic EL display device, light leakage occurs, There is a case.

The in-plane retardation Ro of the long oblique orientation film of the present embodiment is selected according to the design of the display device to be used. Ro is a value obtained by multiplying the difference between the refractive index nx in the in-plane slow axis direction and the refractive index ny in the plane perpendicular to the slow axis in the plane (Ro = (nx-ny) xd )to be.

The average thickness of the long oblique orientation film of the present embodiment is preferably 1 to 400 占 퐉, more preferably 10 to 200 占 퐉, still more preferably 10 to 60 占 퐉, particularly preferably 15 to 45 占 퐉 to be.

The long oblique orientation film of the present embodiment may have a functional layer on its surface. The functional layer may be an antireflection layer, a low refractive index layer, a hard coating layer, a light scattering layer, a light diffusion layer, an antistatic layer, a conductive layer, an electrode layer, a birefringent layer, a surface energy adjustment layer, a UV absorption layer, A heat resistant layer, a magnetic layer, an oxidation preventing layer, an overcoat layer, and the like.

<Circular Polarizer>

In the circular polarizer of this embodiment, a polarizing plate protective film, a polarizer and a lambda / 4 film are laminated in this order, and the angle formed by the slow axis of the lambda / 4 film and the absorption axis (or transmission axis) . The? / 4 film can be constituted by an optical film (long oblique stretched film) obtained by cutting both ends of the long oblique oriented film of the present embodiment. When the circular polarizer of the present embodiment is used in an organic EL display device, the protective film 313, the polarizer 311, the? / 4 film 316, Respectively. In the present embodiment, it is preferable that a protective film of a polarizing plate, a polarizing film of a retardation film, and a lambda / 4 film are laminated in this order.

When the circular polarizer of the present embodiment is used in a liquid crystal display device, the polarizer protective film, the polarizer, and the? / 4 film are the same as the protective film 506, the polarizer 501, the? / 4 film 503 Respectively. A protective film 506 and a polarizer 501 are disposed outside (on the viewing side) of the display cell 401. A lambda / 4 film 503 is further provided on the viewer side (on the viewer side) The linearly polarized light emitted from the display cell 401 and transmitted through the polarizer 501 is converted into circularly polarized light or elliptically polarized light by the? / 4 film 503. Therefore, in the case where the observer observes the display image of the display device 400 by attaching the polarizing sunglasses, even when observing at an angle (the transmission axis of the polarizer 501 (perpendicular to the absorption axis) It is possible to observe the display image by guiding the component of light parallel to the transmission axis of the polarizing sunglass to the eyes of the observer so that it is possible to suppress the display image from being hardly seen in accordance with the viewing angle.

The circular polarizer of the present embodiment can be produced by using a polarizer obtained by stretching polyvinyl alcohol doped with iodine or a dichroic dye and bonding it with a constitution of? / 4 film / polarizer. The film thickness of the polarizer is 5 to 40 占 퐉, preferably 5 to 30 占 퐉, and particularly preferably 5 to 20 占 퐉.

The polarizing plate can be manufactured by a general method. The alkali saponified? / 4 film is preferably bonded to one side of a polarizer prepared by immersing and stretching a polyvinyl alcohol film in an iodine solution using a fully saponified polyvinyl alcohol aqueous solution.

The polarizing plate may be constituted by bonding a peeling film to the opposite surface of the polarizing plate protective film of the polarizing plate. The protective film and the release film are used for the purpose of protecting the polarizing plate at the time of polarizing plate shipment, product inspection and the like.

<Organic EL Display Device>

6 is a cross-sectional view showing a schematic structure of an organic EL display device 100 as an OLED of the present embodiment. The configuration of the organic EL display device 100 is not limited to this.

The organic EL display device 100 is constituted by forming a circularly polarizing plate 301 on an organic EL element 101 through an adhesive layer 201. [ The organic EL element 101 has a metal electrode 112, a light emitting layer 113, a transparent electrode (such as ITO) 114, and a sealing layer 115 on the substrate 111 using glass or polyimide in this order Consists of. The metal electrode 112 may be composed of a reflective electrode and a transparent electrode.

The circularly polarizing plate 301 includes a quarter wave film 316, an adhesive layer 315, a polarizer 311, an adhesive layer 312, a protective film 313 and a cured layer 314 in this order from the organic EL element 101 side. And the polarizer 311 is sandwiched between the? / 4 film 316 and the protective film 313. The polarizer 311 is formed by laminating a? The circular polarizer 301 is bonded so that the angle formed by the transmission axis of the polarizer 311 and the slow axis of the? / 4 film 316 including the optical film of the present embodiment is about 45 (or 135) .

The protective film 313 preferably has a cured layer 314 laminated thereon. The cured layer 314 not only prevents surface scratches of the organic EL display device 100 but also has the effect of preventing warping by the circularly polarizing plate 301. [ Also, an antireflection layer may be formed on the cured layer 314. The thickness of the organic EL element 101 itself is about 1 mu m.

When voltage is applied to the metal electrode 112 and the transparent electrode 114 in the above structure, electrons are injected into the light emitting layer 113 from the electrode that is the cathode of the metal electrode 112 and the transparent electrode 114, Holes are injected from the electrodes serving as the positive electrodes and recombined in the light emitting layer 113 so that light emission of visible light corresponding to the light emitting characteristics of the light emitting layer 113 occurs. Light generated in the light emitting layer 113 is directly or reflected by the metal electrode 112 and then is taken out to the outside through the transparent electrode 114 and the circularly polarizing plate 301.

Generally, in an organic EL display device, a light emitting element (organic EL element) is formed by sequentially laminating a metal electrode, a light emitting layer, and a transparent electrode on a transparent substrate. Here, the light emitting layer is a laminate of various organic thin films, for example, a stacked body of a hole injection layer including a triphenylamine derivative or the like and a light emitting layer containing a fluorescent organic solid such as anthracene, A multilayer body with an electron injecting layer including a hole injecting layer, a hole injecting layer, and a derivative, and a laminate of these hole injecting layers, a light emitting layer, and an electron injecting layer.

In the organic EL display device, holes and electrons are injected into the light emitting layer by applying a voltage to the transparent electrode and the metal electrode, and the energy generated by the recombination of the holes and the electrons excites the fluorescent substance, The light is emitted on the same principle as that of emitting light. The mechanism of recombination in the middle is similar to that of a general diode, and as can be expected from this, the current and the light emission intensity exhibit strong nonlinearity accompanied by rectification with respect to the applied voltage.

In the organic EL display device, at least one of the electrodes must be transparent in order to extract light from the light emitting layer, and a transparent electrode formed of a transparent conductor such as indium tin oxide (ITO) is used as the anode. On the other hand, it is important to use a substance having a low work function for the cathode in order to facilitate injection of electrons and increase the luminous efficiency, and metal electrodes such as Mg-Ag and Al-Li are generally used.

In the organic EL display device having such a structure, the light emitting layer is formed of a very thin film with a thickness of about 10 nm. Therefore, the light emitting layer almost completely transmits the light, like the transparent electrode. As a result, the light incident on the surface of the transparent substrate at the time of non-light emission, the light transmitted through the transparent electrode and the light emitting layer and reflected by the metal electrode is again directed to the surface side of the transparent substrate, The display surface looks like a mirror surface.

The circularly polarizing plate of the present embodiment is suitable for organic EL display devices in which such external light reflection is particularly problematic.

That is, half of the external light incident from the outside of the organic EL element 101 by the room illumination or the like is absorbed by the polarizer 311 of the circularly polarizing plate 301 at the time of non-emission of the organic EL element 101, Half of the light is transmitted as linearly polarized light, and is incident on the? / 4 film 316. The light incident on the? / 4 film 316 is incident on the? / 4 film 316 because the transmission axis of the polarizer 311 and the slow axis of the? / 4 film 316 intersect at 45 degrees (or 135 degrees) And is converted into circularly polarized light by passing through the film 316.

The circularly polarized light emitted from the lambda / 4 film 316 is inverted in phase by 180 degrees when it is mirror-reflected by the metal electrode 112 of the organic EL element 101, and is reflected as circularly polarized light in the reverse rotation direction. This reflected light is converted into linearly polarized light perpendicular to the transmission axis of the polarizer 311 (parallel to the absorption axis) by being incident on the lambda / 4 film 316, so that all of the reflected light is absorbed by the polarizer 311, . That is, by the circularly polarizing plate 301, reflection of external light in the organic EL element 101 can be reduced.

<Liquid Crystal Display Device>

7 is a cross-sectional view showing a schematic structure of a display device 400 as a liquid crystal display device of the present embodiment. The display device 400 is constituted by disposing a polarizing plate 402 on one side of the display cell 401.

In the case of a liquid crystal display device, the display cell 401 can be a liquid crystal cell in which a liquid crystal layer is sandwiched between a pair of substrates. In the liquid crystal cell, a polarizing plate 402, a separate polarizing plate disposed in a cross-Nicol state, and a backlight for illuminating the liquid crystal cell are provided on the side opposite to the polarizing plate 402. In FIG. 7, have.

The display device 400 may have a front window 403 on the side opposite to the display cell 401 with respect to the polarizing plate 402. [ The front window 403 serves as an external cover of the display device 400, and is constituted by, for example, a cover glass. Between the front window 403 and the polarizing plate 402, a filler 404 containing, for example, an ultraviolet curable resin is filled. An air layer is formed between the front window 403 and the polarizing plate 402. When the front window 403 and the polarizing plate 402 are reflected from the interface between the air layer and the front window 403, May be deteriorated in some cases. However, since the air layer is not formed between the front window 403 and the polarizing plate 402 by the filler 404, deterioration of the visibility of the display image due to reflection of light at the interface can be avoided.

The polarizing plate 402 has a polarizer 501 which transmits a predetermined linearly polarized light. The? / 4 film 503 and the cured layer 504 including the ultraviolet curable resin are laminated in this order on the one surface side (opposite to the display cell 401) of the polarizer 501 via the adhesive layer 502 Respectively. A protective film 506 is bonded to the other surface side (the display cell 401 side) of the polarizer 501 through an adhesive layer 505. [

The polarizer 501 is obtained, for example, by staining a polyvinyl alcohol film with a dichroic dye and stretching it at a high magnification. After the polarizer 501 is subjected to an alkali treatment (also referred to as a saponification treatment), a lambda / 4 film 503 is bonded to one side via an adhesive layer 502 and a protective film 506 is bonded to the other side of the adhesive layer 505. [ Respectively.

The adhesive layer 502 占 505 is, for example, a layer containing a polyvinyl alcohol adhesive (PVA adhesive, waterbath), but may be a layer containing an ultraviolet curable adhesive (UV adhesive). The adhesive is a liquid in the state of being applied to the adhesive surface, and after the application, it is cured by drying or ultraviolet irradiation to adhere the two. That is, the adhesive layer 502 · 505 adheres the polarizer 501 and the λ / 4 film 503, and the polarizer 501 and the protective film 506, respectively, in accordance with the state change from the liquid phase. As described above, the adhesive layer 502 占 505 has a pressure-sensitive adhesive layer (a sheet-like pressure-sensitive adhesive layer having a pressure-sensitive adhesive on the substrate) for adhering the both without causing such a change in state, .

The? / 4 film 503 is a layer which gives an in-plane retardation of about 1/4 of the wavelength of transmitted light. In the present embodiment, for example, the? / 4 film 503 contains a cellulose resin (cellulose-based polymer). The? / 4 film 503 may contain a polycarbonate resin (polycarbonate-based polymer) instead of the cellulose-based polymer, or may include a cycloolefin-based resin (cycloolefin-based polymer). However, from the viewpoint of chemical resistance, it is preferable that the? / 4 film 503 contains a cellulose-based polymer or polycarbonate-based polymer.

The? / 4 film 503 is a? / 4 film of a thin film having a thickness of 10 μm to 70 μm. The angle (angle of intersection) between the slow axis of the? / 4 film 503 and the absorption axis of the polarizer 501 is 30 ° to 60 ° so that the linearly polarized light from the polarizer 501 becomes? 4 film 503 into circularly polarized light or elliptically polarized light.

The cured layer 504 (also referred to as a hard coat layer) is composed of an active energy ray curable resin (for example, an ultraviolet curable resin).

The protective film 506 is composed of an optical film including, for example, a cellulose-based resin (a cellulosic polymer), an acrylic resin, a cyclic polyolefin (COP), and a polycarbonate (PC). Although the protective film 506 is provided as a film for simply protecting the back side of the polarizer 501, it may be provided as an optical film serving also as a retardation film having a desired optical compensation function.

In the case of a liquid crystal display device, a separate polarizing plate disposed on the side opposite to the polarizing plate 402 with respect to the display cell 401 (liquid crystal cell) is constituted by sandwiching the surface of the polarizing plate with two optical films, And the optical film may be the same as the polarizer 501 and the protective film 506 of the polarizing plate 402.

Here, the polarizer 501 and the? / 4 film 503 may be long ones. In this case, it is preferable that the slow axis of the? / 4 film 503 is inclined by 30 to 60 degrees with respect to the longitudinal direction of the? / 4 film 503. In this case, a long? / 4 film 503 is produced by oblique stretching to form a roll-shaped film, which is then joined to the roll-type polarizer 501 by a roll-to-roll method to produce a long polarizing plate 402 . Therefore, as compared with the case where the polarizing plate 402 is manufactured by a batch process in which the film pieces are bonded one by one, the productivity is remarkably improved and the yield can be greatly improved.

Further, an easy adhesion layer for improving the adhesiveness of the? / 4 film 503 may be provided on the adhesive layer 502 side of the? / 4 film 503. The adhesion facilitating layer is formed by performing an adhesion facilitating treatment on the adhesive layer 502 side of the? / 4 film 503. Examples of the adhesion facilitating treatment include a corona discharge treatment, a plasma treatment, a frame treatment, an itro treatment, a glow treatment, an ozone treatment, a primer coating treatment, and the like. From the viewpoint of productivity, the corona treatment and the plasma treatment are preferable as the adhesion facilitating treatment during the adhesion facilitating treatment.

< Example >

Hereinafter, specific examples of the present invention will be described, but the present invention is not limited to these examples. In the following description, "parts" or "%" are used, but unless otherwise stated, they are expressed as "parts by mass" or "% by mass".

[Production of Long Film 1]

A long film 1 was produced by the following method. The long film 1 is a cellulose ester based resin film.

&Quot; Fine particle dispersion liquid &

Fine particles (Aerosil R972V manufactured by Nippon Aerosil Co., Ltd.) 11 parts by mass

ethanol 89 parts by mass

The mixture was stirred with a dissolver for 50 minutes, and then dispersed with mannitol. Thus, a fine particle dispersion 1 was prepared.

&Lt; Particulate additive liquid &

On the basis of the following composition, the fine particle dispersion was slowly added to a dissolution tank containing methylene chloride while stirring sufficiently. And dispersed by an attritor so that the particle diameter of the secondary particles became a predetermined value. This was filtered with Finetmet NF (manufactured by Nippon Seisen Co., Ltd.) to prepare a fine particle addition liquid 1.

Methylene chloride 99 parts by mass

Fine Particle Dispersion 1 5 parts by mass

«Preparation of Dope»

A dope of the following composition was prepared. First, methylene chloride and ethanol were added to the pressurized dissolution tank. Then, cellulose acetate was added to the pressurized dissolution tank containing the solvent while stirring. The solution was heated and completely dissolved with stirring, and the solution was filtered using Azumi Rosa No. 244 manufactured by Azumi Co., Ltd. to prepare a lead solution. Thereafter, the initiator solution and the respective materials were put into a closed container so that the following ratio was obtained, and dissolved while stirring to prepare a dope. As the sugar ester compound and the ester compound, the compound synthesized by the following synthesis examples was used.

"Composition of Dope"

Methylene chloride 340 parts by mass

ethanol 64 parts by mass

Cellulose acetate propionate (acetyl group substitution degree: 1.50, propionyl group substitution degree: 0.90, total substitution degree: 2.40) 100 parts by mass

Ester ester compound 5.0 parts by mass

Ester compound 5.0 parts by mass

Ultraviolet absorber 1.5 parts by mass

Particle addition liquid 1 1 part by mass

&Lt; Synthesis of sugar ester compound &

A sugar ester compound was synthesized by the following process.

34.2 g (0.1 mol) of sucrose, 180.8 g (0.6 mol) of anhydrous benzoic acid, and 379.7 g (4.8 mol) of pyridine were fed into 4-necked colbins equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen gas introducing tube, The temperature was elevated while nitrogen gas was bubbled through the nitrogen gas introduction tube, and the esterification reaction was carried out at 70 DEG C for 5 hours.

Subsequently, the internal pressure of collven was reduced to 4 × 10 ² Pa or less, excess pyridine was distilled off at 60 ° C., the pressure in corbene was reduced to 1.3 × 10 Pa or less, and the temperature was raised to 120 ° C. to obtain an anhydrous benzoic acid Most were distilled off.

Finally, 100 g of water was added to the separated toluene layer, and the mixture was washed with water at room temperature for 30 minutes. Then, the toluene layer was collected, and toluene was distilled off at 60 캜 under reduced pressure (4 × 10 ² Pa or less) 1, A-2, A-3, A-4 and A-5 (sugar ester compound).

The obtained mixture was analyzed by HPLC and LC-MASS to find that 1.3 mass% of A-1, 13.4 mass% of A-2, 13.1 mass% of A-3, 31.7 mass% of A- Mass%. The average degree of substitution was 5.5.

&Quot; Measurement conditions of HPLC-MS &

1) LC section

(JASCO CO-965), a detector (JASCO UV-970-240nm), a pump (JASCO PU-980), a condenser (JASCO DG-980-50) manufactured by Nippon Bunko Co.,

Column: Inertsil ODS-3 Particle diameter 5 占 퐉 4.6 占 250 mm (GL Science Co., Ltd.)

Column temperature: 40 DEG C

Flow rate: 1 ml / min

Mobile phase: THF (1% acetic acid): H ₂ O (50:50)

Injection volume: 3μl

2) MS Department

Apparatus: LCQ DECA (Thermo Quest Co., Ltd.)

Ionization method: Electrospray ionization (ESI) method

Spray Voltage: 5kV

Capillary temperature: 180 ° C

Vaporizer temperature: 450 ° C

&Lt; Synthesis of ester compound &

An ester compound was synthesized by the following steps.

251 g of 1,2-propylene glycol, 278 g of phthalic anhydride, 91 g of adipic acid, 610 g of benzoic acid and 0.191 g of tetraisopropyl titanate as an esterification catalyst were put into a 2 L four-necked flask equipped with a thermometer, And the temperature is gradually raised while stirring in a nitrogen stream until the temperature becomes 230 캜. After dehydration condensation reaction for 15 hours, unreacted 1,2-propylene glycol was removed by distillation under reduced pressure at 200 占 폚 to obtain an ester compound. The ester compound has an ester of benzoic acid at the end of the polyester chain formed by condensation of 1,2-propylene glycol, phthalic anhydride and adipic acid. The acid value of the ester compound was 0.10, and the number average molecular weight was 450.

«Deposition»

Subsequently, the endless belt fusing device was used to uniformly soften the dope on a support comprising a stainless steel belt. Then, on the support, the solvent was evaporated until the amount of residual solvent in the web (cast) became 75%, the web was peeled off on the support, and the drying was terminated while transporting the web to a plurality of rolls. Of long film 1 was obtained. The produced long film 1 was wound in a straight winding by a winding device, cut once along the width direction, and then wound in an oscillating winding with a winding device. A long film 1 wound in a straight winding state is referred to as winding state 1, and a long film 1 wound in an oscillating winding state is referred to as winding body 2.

[Production of Long Film 2]

A long film 2 was produced by the following method. The long film 2 is an alicyclic olefin polymer resin (COP resin).

1.2 parts of 1-hexene, 0.15 part of dibutyl ether and 0.30 part of triisobutylaluminum were added to 500 parts of dehydrated cyclohexane in a nitrogen atmosphere at room temperature and mixed. Then, the mixture was mixed with tricyclo [4.3. (Hereinafter abbreviated as &quot; DCP &quot;), 1,4-butanediol, 1,4-butanediol, (Hereinafter abbreviated as MTD) of 140 parts and 8-methyl-tetracyclo [4.4.0.12,5.17,10] -dodeca-3-ene (hereinafter abbreviated as MTD) and a mixture of norbornene monomer mixture containing tungsten hexachloride 0.7% toluene solution) was continuously added over 2 hours to polymerize. 1.06 parts of butyl glycidyl ether and 0.52 parts of isopropyl alcohol were added to the polymerization solution, and the polymerization catalyst was deactivated to terminate the polymerization reaction.

Subsequently, 270 parts of cyclohexane was added to 100 parts of the reaction solution containing the obtained ring-opening polymer, and 5 parts of a nickel-alumina catalyst (manufactured by Nittsu Kagaku Co., Ltd.) was added as a hydrogenation catalyst. , And the mixture was heated to 200 DEG C and reacted for 4 hours to obtain a reaction solution containing 20% of DCP / MTF / MTD ring opening polymerized hydrogenated polymer. After the hydrogenation catalyst was removed by filtration, a soft polymer (Septon 2002, manufactured by Kuraray Co., Ltd.) and an antioxidant (Irganox 1010, manufactured by Ciba Specialty Chemicals) were added and dissolved in the obtained solution, respectively 0.1 part).

Subsequently, cyclohexane and other volatile components as a solvent were removed from the solution by using a cylindrical condensing drier (manufactured by Hitachi, Ltd.), and the hydrogenated polymer was extruded from the extruder in a molten state into a strand shape, Respectively. The copolymerization ratio of the respective norbornene monomers in the polymer was calculated from the composition of the residual norbornenes in the solution after the polymerization (by gas chromatography). As a result, it was found that almost all of the composition of DCP / MTF / MTD = Respectively. The ring opening polymer hydrogenation product had a weight average molecular weight (Mw) of 31,000, a molecular weight distribution (Mw / Mn) of 2.5, a hydrogenation rate of 99.9%, and a Tg of 134 캜. The pellets of the obtained ring opening polymeric hydrogenation product were dried at 70 DEG C for 2 hours using a hot-air drier through which air was circulated to remove moisture.

Subsequently, the pellets were melt-knitted using a uniaxial extruder (manufactured by Mitsubishi Kasei Kogyo K.K., screw diameter 90 mm, T-die lip portion material: tungsten carbide, peel strength with molten resin 44 N) Followed by extrusion molding to produce a long film 2 (film thickness 30 μm) as a cycloolefin polymer film. Extrusion molding was carried out in a clean room of class 10,000 or less under the molding conditions of a molten resin temperature of 240 占 폚 and a T-die temperature of 240 占 폚. The produced long film 2 was wound with a straight winding by a winding device, cut once along the width direction, and then wound into an oscillating winding with a winding device. The long film 2 wound in a straight wound state is referred to as winding state 3, and the long film 2 wound in an oscillating winding state is referred to as winding body 4.

[Acquisition of optical film 1]

The winding body 1 of the long film 1 including the cellulose ester resin (straight wound) was set in the film feeding portion 2 of the manufacturing apparatus 1 shown in Fig. 1 and the long film 1 Was fed to the stretching section 5 and subjected to oblique stretching to obtain a long oblique orientation film (long oblong stretched film) 1. At this time, in the stretching portion 5, oblique stretching was performed so that the orientation angle? (Angle formed by the slow axis and the width direction) of the film was approximately 45 degrees. The film conveying speed at this time was 15 m / min. The film thickness of the long oblique orientation film 1 was 35 탆.

Subsequently, the long oblique orientation film 1 obtained by the oblique stretching in the stretching section 5 is supplied to the film cutting apparatus 8 shown in Fig. 4, and both end portions in the width direction of the oblong obliquely- An optical film 1 as a product was obtained. In the film cutting apparatus 8 of Fig. 4, the toe angle &amp;thetas; 1 is 0.01 degrees on the inward side (inside of the film) in the first cut portion 8a and out side (outside the film) in the second cut portion 8b , And the angle &amp;thetas; 2 was 40 DEG. The obtained optical film 1 was wound on a winding core in a film winding portion 9.

[Acquisition of optical film 2]

The winding body 2 of the long film 1 including the cellulose ester resin (with the oscillation wound) is set in the film feeding portion 2, the long film 1 is fed out, and the warp stretching is performed in the stretching portion 5 After obtaining the oblique orientation film 2, both ends of the film were cut with the film cutting device 8 of Fig. 4 to obtain the optical film 2 as a product. Other than that, it is the same as the production of the optical film 1.

[Acquisition of optical film 3]

The winding body 3 of the long film 2 including the COP resin (wound by straight winding) was set in the film feed portion 2, the long film 2 was fed out and the warp stretching was performed in the stretching portion 5, 3 was obtained, and both ends of the film were cut with the film cutting device 8 of FIG. 4 to obtain an optical film 3 as a product. Other than that, it is the same as the production of the optical film 1.

[Acquisition of optical film 4]

The winding body 4 of the long film 2 containing the COP resin (with the oscillation wound) was set in the film feed portion 2, the long film 2 was fed out, the warp stretching was performed in the stretching portion 5, After the film 4 was obtained, both ends of the film were cut with the film cutting device 8 of Fig. 4 to obtain the optical film 4 as a product. Other than that, it is the same as the production of the optical film 1.

[Acquisition of optical film 5]

The winding 1 of the long film 1 including the cellulose ester resin (straight wound) was set in the film feed portion 2, the long film 1 was fed out, the warp stretching was performed in the stretching portion 5, After obtaining the orientation film 5, both ends of the film were cut with the film cutting device 8 'shown in Fig. 5 to obtain the optical film 5 as a product. Other than that, it is the same as the production of the optical film 1. In the film cutting apparatus 8 'of Fig. 5, the toe angle [theta] 1 is set to -0.01 in the inward side (inside of the film) in both the first cutout 8a and the second cutout, Respectively.

[Acquisition of optical film 6]

The winding body 2 of the long film 1 including the cellulose ester resin (with the oscillation wound) is set in the film feeding portion 2, the long film 1 is fed out, and the warp stretching is performed in the stretching portion 5 After obtaining the oblique orientation film 6, both ends of the obliquely oriented film 6 were cut with the film cutting device 8 'of Fig. 5 to obtain an optical film 6 as a product. Other than that, the production of the optical film 5 is the same.

[Acquisition of optical film 7]

In the production of the optical film 1, the toe angle? 1 is set to 0.5 degrees at the inward side (inside the film) in the first cut portion 8a and at the out side (outside the film) in the second cut portion 8b, °. Otherwise, the optical film 7 was obtained in the same manner as in the production of the optical film 1.

〔evaluation〕

(mustache)

The presence or absence of a whisker (fibrous foreign matter in the form of a beard) was visually observed at both ends (cut portions) of the respective optical films 1 to 6, and the state of both ends was evaluated based on the following criteria.

"Evaluation standard"

○ ... No beard.

× ... Bearded.

(Fluffy diary)

At both ends of each of the optical films 1 to 6, the presence or absence of napping fibers was visually observed, and the state of both ends was evaluated based on the following criteria.

"Evaluation standard"

○ ... No fluffy diary.

× ... Lots of fluff.

(Truncated state)

Both ends of each of the optical films 1 to 6 were visually observed, and both parts of the cut state were evaluated based on the following criteria.

"Evaluation standard"

○ ... The cutting state is fairly good and there is no risk of breakage.

△ ... The cut-off state is almost good, and there is no possibility of breakage.

× ... The cutting state is poor and there is a risk of breakage.

Table 1 shows the evaluation results of the respective optical films 1 to 6. In Table 1, CE indicates a cellulose ester-based resin, and COP indicates an alicyclic olefin polymer-based resin.

As can be seen from Table 1, at least at the end portions of the optical films 5 and 6, a fuzzing pattern was found and the cut-off state of the end portions was also defective. On the other hand, in the optical films 1 to 4 and 7, It can be seen that almost good results are obtained even in the cut-off state of the end portions. This is because when the optical films 1 to 4 and 7 are obtained, the upper blade 10a of the film cutting device 8 is positioned on the side closer to the alignment direction with respect to the lower blade 10b, The resistance at the time of cutting due to the orientation in the oblique direction of the long obliquely oriented film F 'becomes small, so that the long obliquely oriented film F' is hardly repelled at the time of cutting, and as a result, the cut state is improved , It is considered that the occurrence of beard or fluffy weather is suppressed.

In addition, as described above, when the both ends of the film are cut after obliquely stretching the long film rolled by the oscillation, the film tends to be repelled in the alignment direction at the time of cutting due to the influence of the film thickness deviation due to the oscillation winding. However, by cutting the film using the constituent film cutting apparatus 8 of Fig. 4, the elasticity in the film orientation direction is suppressed, so that in the optical films 2 and 4, the deterioration of the cut state is minimized, It is considered that the cutting state can be kept almost good. Therefore, the method of cutting the film using the film cutting apparatus 8 of FIG. 4 is particularly effective when cutting the both ends of the film after obliquely stretching the long film having the oscillated winding.

In addition, since the COP resin is more brittle than the cellulose ester-based resin, whiskers and fluffs are likely to occur at the time of cutting and breakage at the time of cutting tends to occur. However, as a result of the optical films 3 and 4 including the COP resin, The method of cutting the film using the film cutting apparatus 8 shown in Fig. 4 is not particularly limited as long as it is the same as the results of the optical films 1 and 2 including the cellulose ester based resin, It is very effective in cutting both ends.

Further, from the results of the optical films 1 and 7, when the toe angle? 1 increases, it is preferable that the toe angle? 1 is small because the evaluation of the cut state is one step lower.

In the above, an example of cutting a long obliquely-oriented film having an orientation angle? Of about 45 is described. However, even if the orientation angle is an angle other than about 45 degrees, by applying the same cutting method as in the present embodiment, It was confirmed that the same effect as that of the embodiment can be obtained.

In the above description, a long oblique orientation film including a cellulose ester resin or a COP resin is used as the object to be cut. However, it is also possible to use a long oblique orientation film containing other resins (for example, a polycarbonate resin and an acrylic resin) It was confirmed that the same effect as that of the present embodiment can be obtained by applying the same cutting method as that of the present embodiment even when the long oblique orientation film is to be cut.

The method and apparatus for manufacturing an optical film of the present embodiment described above can be expressed as follows.

1. A method for producing a long obliquely-oriented film, comprising: a cutting step of cutting both end portions in the width direction of a long oblique oriented film whose orientation direction is inclined with respect to the width direction in the film plane by a first cut portion and a second cut portion, And cutting the both end portions to obtain a remaining portion as an optical film,

Wherein the first cut portion and the second cut portion are formed by cutting

A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,

And a second blade disposed on the other side of the film surface and inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane,

In the cutting step,

In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed between the plane forming the toe angle of the second blade and the orientation direction of the long oblique orientation film is reduced, And the long oblique orientation film is cut to cut the optical film.

2. The long oblique orientation film as described in 1 above, wherein the long obliquely-oriented film is a long obliquely stretched film which is stretched in an oblique direction with respect to the width direction, Gt;

3. The method for producing an optical film as described in 1 or 2 above, wherein the long oblique orientation film comprises an alicyclic olefin polymer-based resin.

And a second cut section for cutting both end portions in the width direction of the long oblique orientation film whose alignment direction is inclined with respect to the width direction in the film plane, The optical film production apparatus according to claim 1,

Wherein the first cut portion and the second cut portion are formed by cutting

A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,

Wherein the rotating shaft is inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane, And a second blade for cutting and cutting the long oblique oriented film therebetween,

In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed by the plane forming the toe angle of the second blade and the alignment direction of the long oblique orientation film is reduced, .

INDUSTRIAL APPLICABILITY The present invention is applicable to the production of an optical film used for a polarizing plate of a liquid crystal display.

1: Manufacturing apparatus
8a: first cut portion
8b: second cut portion
10a: upper blade (second blade)
10a ₁ :
10b: lower blade (first blade)
10b ₁ :
F: Optical film
F ': long oblique oriented film
S: cotton
Ta: end
Tb: end
θ: angle
θ1: Tow angle

Claims (4)

And a cutting step of cutting the both end portions in the width direction of the long oblique orientation film in which the alignment direction is inclined with respect to the width direction in the film plane by the first cut portion and the second cut portion, And a remaining portion is obtained as an optical film,
Wherein the first cut portion and the second cut portion are formed by cutting
A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,
And a second blade disposed on the other side of the film surface and inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane,
In the cutting step,
In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed between the plane forming the toe angle of the second blade and the orientation direction of the long oblique orientation film is reduced, And the long oblique orientation film is cut to cut the optical film. The stretched film according to claim 1, wherein the long oblique orientation film is a long obliquely stretched film stretched in an oblique direction with respect to the width direction, Gt; The method for producing an optical film according to claim 1 or 2, wherein the long oblique orientation film comprises an alicyclic olefin polymer resin. And a first cut portion and a second cut portion that respectively cut both end portions in the width direction of the long obliquely-oriented film whose alignment direction is inclined with respect to the width direction in the film plane, wherein both ends of the long obliquely- And the remaining portion is obtained as an optical film,
Wherein the first cut portion and the second cut portion are formed by cutting
A first blade disposed on one side of the film surface of the long oblique orientation film and having a rotation axis located along the width direction,
Wherein the rotating shaft is inclined with respect to the width direction by an angle corresponding to a tow angle with respect to the first blade in the film plane, And a second blade for cutting and cutting the long oblique oriented film therebetween,
In each of the first cut portion and the second cut portion, of the one side and the other side in the width direction with respect to the first blade, the second blade is inclined in a direction in which the tow angle with respect to the first blade increases , The second blade is disposed on the side where the angle formed by the plane forming the toe angle of the second blade and the alignment direction of the long oblique orientation film is reduced, .

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